Abstract

We report a coherent terahertz (THz) imaging system that utilises a quantum cascade laser (QCL) operating in pulsed-mode as both the source and detector. The realisation of a short-pulsed THz QCL feedback interferometer permits both high peak powers and improved thermal efficiency, which enables the cryogen-free operation of the system. In this work, we demonstrated pulsed-mode swept-frequency laser feedback interferometry experimentally. Our interferometric detection scheme not only permits the simultaneous creation of both amplitude and phase images, but inherently suppresses unwanted background radiation. We demonstrate that the proposed system utilising microsecond pulses has the potential to achieve 0.25 mega-pixel per second acquisition rates, paving the pathway to video frame rate THz imaging.

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References

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2018 (9)

D. M. Mittleman, “Twenty years of terahertz imaging,” Opt. Express 26, 9417–9431 (2018).
[Crossref] [PubMed]

H. Guerboukha, K. Nallappan, and M. Skorobogatiy, “Toward real-time terahertz imaging,” Adv. Opt. Photon. 10, 843–938 (2018).
[Crossref]

H. Guerboukha, K. Nallappan, and M. Skorobogatiy, “Exploiting k-space/frequency duality toward real-time terahertz imaging,” Optica 5, 109–116 (2018).
[Crossref]

L. Marchese, M. Doucet, N. Blanchard, M. Leclerc, M. Terroux, M. Briand, M. Otis, M. Jacob, C. Akitegetse, H. Spisser, L. Mercier, F. Duchesne, M. Girard, L. Gagnon, M. Massicote, B. Fisette, M. Tremblay, B. Tremblay, P. Bourqui, and A. Bergeron, “Overcoming the challenges of active THz/MM-wave imaging: an optics perspective,” Proc. SPIE 10639, 106392B (2018).

M. Yamagiwa, T. Ogawa, T. Minamikawa, D. G. Abdelsalam, K. Okabe, N. Tsurumachi, Y. Mizutani, T. Iwata, H. Yamamoto, and T. Yasui, “Real-time amplitude and phase imaging of optically opaque objects by combining full-field off-axis terahertz digital holography with angular spectrum reconstruction,” J. Infrared Millim. Terahertz Waves 39, 561–572 (2018).
[Crossref]

K. Bertling, S. Han, T. Wu, C. Zhao, Y. L. Lim, P. Dean, S. P. Khanna, D. Indjin, E. H. Linfield, A. G. Davies, S. J. Wilson, T. Taimre, and A. D. Rakić, “Determining ethanol content of liquid solutions using laser feedback interferometry with a terahertz quantum cascade laser,” IEEE Sens. Lett. 2, 1–4 (2018).
[Crossref]

G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonić, P. Dean, A. Valavanis, D. Indjin, and A. D. Rakić, “Frequency tuning range control in pulsed terahertz quantum-cascade lasers: Applications in interferometry,” IEEE J. Quantum Electron. 54, 1–8 (2018).
[Crossref]

F. Qiu, Z. Tan, Z. Fu, W. Wan, M. Li, C. Wang, and J. Cao, “Reflective scanning imaging based on a fast terahertz photodetector,” Opt. Commun. 427, 170–174 (2018).
[Crossref]

I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
[Crossref]

2017 (8)

X. Qi, G. Agnew, I. Kundu, T. Taimre, Y. L. Lim, K. Bertling, P. Dean, A. Grier, A. Valavanis, E. H. Linfield, A. G. Davies, D. Indjin, and A. D. Rakić, “Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer,” Opt. Express 25, 10153–10165 (2017).
[Crossref] [PubMed]

H.-W. Hübers, H. Richter, R. Eichholz, M. Wienold, K. Biermann, L. Schrottke, and H. Grahn, “Heterodyne spectroscopy of frequency instabilities in terahertz quantum-cascade lasers induced by optical feedback,” IEEE J. Sel. Top. Quantum Electron. 23, 1800306 (2017).
[Crossref]

G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonic, P. Dean, A. Valavanis, P. Harrison, D. Indjin, and A. D. Rakic, “Temperature dependent high speed dynamics of terahertz quantum cascade lasers,” IEEE J. Sel. Top. Quantum Electron. 23, 1200209 (2017).
[Crossref]

L. Valzania, P. Zolliker, and E. Hack, “Topography of hidden objects using THz digital holography with multi-beam interferences,” Opt. Express 25, 11038–11047 (2017).
[Crossref] [PubMed]

N. Kanda, K. Konishi, N. Nemoto, K. Midorikawa, and M. Kuwata-Gonokami, “Real-time broadband terahertz spectroscopic imaging by using a high-sensitivity terahertz camera,” Sci. Rep. 7, 42540 (2017).
[Crossref] [PubMed]

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
[Crossref]

L. H. Li, L. Chen, J. R. Freeman, M. Salih, P. Dean, A. G. Davies, and E. H. Linfield, “Multi-watt high-power THz frequency quantum cascade lasers,” Electron. Lett. 53, 799–800 (2017).
[Crossref]

G. Hernandez-Cardoso, S. Rojas-Landeros, M. Alfaro-Gomez, A. Hernandez-Serrano, I. Salas-Gutierrez, E. Lemus-Bedolla, A. Castillo-Guzman, H. Lopez-Lemus, and E. Castro-Camus, “Terahertz imaging for early screening of diabetic foot syndrome: A proof of concept,” Sci. Rep. 7, 42124 (2017).
[Crossref] [PubMed]

2016 (10)

A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
[Crossref]

P. Caine, M. U. Javed, and R. O. S. Karoo, “A desmoplastic melanoma detected by an airport security scanner,” J. Plast. Reconstr. Aesthet. Surg. 69, 874–876 (2016).
[Crossref] [PubMed]

E. Hack, L. Valzania, G. Gäumann, M. Shalaby, C. P. Hauri, and P. Zolliker, “Comparison of thermal detector arrays for off-axis THz holography and real-time THz imaging,” Sensors 16, 221 (2016).
[Crossref] [PubMed]

S. Han, K. Bertling, P. Dean, J. Keeley, A. D. Burnett, Y. L. Lim, S. P. Khanna, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, T. Taimre, and A. D. Rakic, “Laser feedback interferometry as a tool for analysis of compound mixtures at terahertz frequencies: towards imaging and identification of plastic explosives,” Sensors 16, 352 (2016).
[Crossref]

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
[Crossref] [PubMed]

M. Wienold, T. Hagelschuer, N. Rothbart, L. Schrottke, K. Biermann, H. Grahn, and H.-W. Hübers, “Real-time terahertz imaging through self-mixing in a quantum-cascade laser,” Appl. Phys. Lett. 109, 011102 (2016).
[Crossref]

A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
[Crossref] [PubMed]

T. Hagelschuer, M. Wienold, H. Richter, L. Schrottke, K. Biermann, H. T. Grahn, and H.-W. Hübers, “Terahertz gas spectroscopy through self-mixing in a quantum-cascade laser,” Appl. Phys. Lett. 109, 191101 (2016).
[Crossref]

P. Dean, O. Mitrofanov, J. Keeley, I. Kundu, L. Li, E. H. Linfield, and A. G. Davies, “Apertureless near-field terahertz imaging using the self-mixing effect in a quantum cascade laser,” Appl. Phys. Lett. 108, 091113 (2016).
[Crossref]

K. Bertling, T. Taimre, G. Agnew, Y. L. Lim, P. Dean, D. Indjin, S. Höfling, R. Weih, M. Kamp, M. von Edlinger, J. Koeth, and A. D. Rakić, “Simple electrical modulation scheme for laser feedback imaging,” IEEE J. Sensors 16, 1937–1942 (2016).
[Crossref]

2015 (9)

F. P. Mezzapesa, L. L. Columbo, C. Rizza, M. Brambilla, A. Ciattoni, M. Dabbicco, M. S. Vitiello, and G. Scamarcio, “Photo-generated metamaterials induce modulation of CW terahertz quantum cascade lasers,” Sci. Rep. 5, 16207 (2015).
[Crossref] [PubMed]

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, M. Nikolić, A. Valavanis, J. Cooper, P. Dean, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, Z. Ikonić, D. Indjin, and A. D. Rakić, “Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations,” Appl. Phys. Lett. 106, 161105 (2015).
[Crossref]

T. Taimre, M. Nikolić, K. Bertling, Y. L. Lim, T. Bosch, and A. D. Rakić, “Laser feedback interferometry: a tutorial on the self-mixing effect for coherent sensing,” Adv. Opt. Photon. 7, 570–631 (2015).
[Crossref]

Y. Ren, R. Wallis, D. S. Jessop, R. Degl’Innocenti, A. Klimont, H. E. Beere, and D. A. Ritchie, “Fast terahertz imaging using a quantum cascade amplifier,” Appl. Phys. Lett. 107, 011107 (2015).
[Crossref]

J. Keeley, P. Dean, A. Valavanis, K. Bertling, Y. L. Lim, R. Alhathlool, T. Taimre, L. H. Li, D. Indjin, A. D. Rakić, E. H. Linfield, and A. G. Davies, “Three-dimensional terahertz imaging using swept-frequency feedback interferometry with a quantum cascade laser,” Opt. Lett. 40, 994–997 (2015).
[Crossref] [PubMed]

M. S. Vitiello, G. Scalari, B. Williams, and P. De Natale, “Quantum cascade lasers: 20 years of challenges,” Opt. Express 23, 5167–5182 (2015).
[Crossref] [PubMed]

M. Locatelli, M. Ravaro, S. Bartalini, L. Consolino, M. S. Vitiello, R. Cicchi, F. Pavone, and P. De Natale, “Real-time terahertz digital holography with a quantum cascade laser,” Sci. Rep. 5, 13566 (2015).
[Crossref] [PubMed]

J. E. Mayer and B. B. Adams, “Nodular melanoma serendipitously detected by airport full body scanners,” Dermatology 230, 16–17 (2015).
[Crossref]

R. Fukasawa, “Terahertz imaging: Widespread industrial application in non-destructive inspection and chemical analysis,” IEEE Trans. THz Sci. Technol. 5, 1121–1127 (2015).

2014 (8)

P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. Lim, R. Alhathlool, A. Burnett, L. Li, S. Khanna, D. Indjin, T. Taimre, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging using quantum cascade lasers – a review of systems and applications,” J. Phys. D: Appl. Phys. 47, 374008 (2014).
[Crossref]

A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, S. J. Wilson, M. Nikolic, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, B. Ferguson, G. Walker, H. Schaider, and H. P. Soyer, “THz QCL self-mixing interferometry for biomedical applications,” Proc. SPIE 9199, 9199M (2014).

L. Li, L. Chen, J. Zhu, J. Freeman, P. Dean, A. Valavanis, A. G. Davies, and E. H. Linfield, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50, 309–311 (2014).
[Crossref]

T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, and A. D. Rakić, “Methodology for materials analysis using swept-frequency feedback interferometry with terahertz frequency quantum cascade lasers,” Opt. Express 22, 18633–18647 (2014).
[Crossref] [PubMed]

F. Mezzapesa, M. Petruzzella, M. Dabbicco, H. Beere, D. Ritchie, M. Vitiello, and G. Scamarcio, “Continuous-wave reflection imaging using optical feedback interferometry in terahertz and mid-infrared quantum cascade lasers,” IEEE Trans. Terahertz Sci. Tech. 4, 631–633 (2014).
[Crossref]

Y. L. Lim, T. Taimre, K. Bertling, P. Dean, D. Indjin, S. P. Khanna, A. Valavanis, M. Lachab, H. Schaider, T. W. Prow, H. P. Soyer, E. H. Linfield, A. G. Davies, and A. D. Rakic, “High-contrast coherent terahertz imaging of porcine tissue via swept-frequency feedback interferometry,” Biomed. Opt. Express 5, 3981–3989 (2014).
[Crossref] [PubMed]

H. S. Lui, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, and A. D. Rakic, “Terahertz inverse synthetic aperture radar imaging using self-mixing interferometry with a quantum cascade laser,” Opt. Lett. 39, 2629–2632 (2014).
[Crossref] [PubMed]

F. Mezzapesa, L. Columbo, M. Brambilla, M. Dabbicco, M. Vitiello, and G. Scamarcio, “Imaging of free carriers in semiconductors via optical feedback in terahertz quantum cascade lasers,” Appl. Phys. Lett. 104, 041112 (2014).
[Crossref]

2013 (3)

A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, Z. Ikonic, P. Harrison, A. Valavanis, S. P. Khanna, M. Lachab, S. J. Wilson, E. H. Linfield, and A. G. Davies, “Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis,” Opt. Express 21, 22194–22205 (2013).
[Crossref] [PubMed]

P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. L. Lim, R. Alhathlool, S. Chowdhury, T. Taimre, L. H. Li, D. Indjin, S. J. Wilson, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Coherent three-dimensional terahertz imaging through self-mixing in a quantum cascade laser,” Appl. Phys. Lett. 103, 181112 (2013).
[Crossref]

M. Naftaly, “Metrology issues and solutions in THz time-domain spectroscopy: Noise, errors, calibration,” IEEE Sensors J. 13, 8–17 (2013).
[Crossref]

2012 (5)

C. Yu, S. Fan, Y. Sun, and E. Pickwell-MacPherson, “The potential of terahertz imaging for cancer diagnosis: A review of investigations to date,” Quant. Imaging Med. Surg. 2, 33–45 (2012).
[PubMed]

M. I. Amanti, G. Scalari, M. Beck, and J. Faist, “Stand-alone system for high-resolution, real-time terahertz imaging,” Opt. Express 20, 2772–2778 (2012).
[Crossref] [PubMed]

R. A. Hadi, H. Sherry, J. Grzyb, Y. Zhao, W. Forster, H. M. Keller, A. Cathelin, A. Kaiser, and U. R. Pfeiffer, “A 1 k-pixel video camera for 0.7 – 1.1 terahertz imaging applications in 65-nm CMOS,” IEEE J. Solid-State Circuits 47, 2999–3012 (2012).
[Crossref]

M. C. Phillips and M. S. Taubman, “Intracavity sensing via compliance voltage in an external cavity quantum cascade laser,” Opt. Lett. 37, 2664–2666 (2012).
[Crossref] [PubMed]

S. Donati, “Developing self-mixing interferometry for instrumentation and measurements,” Laser Photonics Rev. 6, 393–417 (2012).
[Crossref]

2011 (6)

P. Dean, Y. L. Lim, A. Valavanis, S. P. Khanna, M. Lachab, R. Kliese, M. Nikolic, Z. Ikonic, D. Indjin, P. Harrison, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging through self-mixing in a quantum cascade laser,” Opt. Lett. 36, 2587–2589 (2011).
[Crossref] [PubMed]

Y. L. Lim, P. Dean, M. Nikolic, R. Kliese, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, Z. Ikonic, P. Harrison, E. H. Linfield, A. G. Davies, S. J. Wilson, and A. D. Rakic, “Demonstration of a self-mixing displacement sensor based on THz quantum cascade lasers,” Appl. Phys. Lett. 99, 081108 (2011).
[Crossref]

S.-H. Ding, Q. Li, Y.-D. Li, and Q. Wang, “Continuous-wave terahertz digital holography by use of a pyroelectric array camera,” Opt. Lett. 36, 1993–1995 (2011).
[Crossref] [PubMed]

M. Kemp, “Screening mail for powders using terahertz technology,” Proc. SPIE 8189, 81890J (2011).
[Crossref]

M. C. Kemp, “Explosives detection by terahertz spectroscopy – a bridge too far?” IEEE Trans. THz Sci. Technol. 1, 282–292 (2011).
[Crossref]

K. B. Cooper, R. J. Dengler, N. Llombart, B. Thomas, G. Chattopadhyay, and P. H. Siegel, “THz imaging radar for standoff personnel screening,” IEEE Trans. THz Sci. Technol. 1, 169–182 (2011).
[Crossref]

2010 (1)

2009 (2)

H. Hoshina, Y. Sasaki, A. Hayashi, C. Otani, and K. Kawase, “Noninvasive mail inspection system with terahertz radiation,” Appl. Spectrosc. 63, 81–86 (2009).
[Crossref] [PubMed]

M. Wienold, L. Schrottke, M. Giehler, R. Hey, W. Anders, and H. T. Grahn, “Low-voltage terahertz quantum-cascade lasers based on LO-phonon-assisted interminiband transitions,” Electron. Lett. 45, 1030–1031 (2009).
[Crossref]

2008 (3)

2007 (2)

R. Appleby and H. B. Wallace, “Standoff detection of weapons and contraband in the 100 GHz to 1 THz region,” IEEE Trans. Antennas Propag. 55, 2944–2956 (2007).
[Crossref]

H.-B. Liu, H. Zhong, N. Karpowicz, Y. Chen, and X.-C. Zhang, “Terahertz spectroscopy and imaging for defense and security applications,” Proc. IEEE 95, 1514–1527 (2007).
[Crossref]

2006 (2)

E. Pickwell and V. Wallace, “Biomedical applications of terahertz technology,” J. Phys. D: Appl. Phys. 39, R301 (2006).
[Crossref]

A. W. M. Lee, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Real-time imaging using a 4.3-THz quantum cascade laser and a 320 × 240 microbolometer focal-plane array,” IEEE Photon. Technol. Lett. 18, 1415–1417 (2006).
[Crossref]

2005 (1)

2002 (2)

R. M. Woodward, B. E. Cole, V. P. Wallace, R. J. Pye, D. D. Arnone, E. H. Linfield, and M. Pepper, “Terahertz pulse imaging in reflection geometry of human skin cancer and skin tissue,” Phys. Med. Biol. 47, 3853 (2002).
[Crossref] [PubMed]

G. Giuliani, M. Norgia, S. Donati, and T. Bosch, “Laser diode self-mixing technique for sensing applications,” J. Opt. A: Pure Appl. Opt. 4, S283 (2002).
[Crossref]

Abdelsalam, D. G.

M. Yamagiwa, T. Ogawa, T. Minamikawa, D. G. Abdelsalam, K. Okabe, N. Tsurumachi, Y. Mizutani, T. Iwata, H. Yamamoto, and T. Yasui, “Real-time amplitude and phase imaging of optically opaque objects by combining full-field off-axis terahertz digital holography with angular spectrum reconstruction,” J. Infrared Millim. Terahertz Waves 39, 561–572 (2018).
[Crossref]

Adams, B. B.

J. E. Mayer and B. B. Adams, “Nodular melanoma serendipitously detected by airport full body scanners,” Dermatology 230, 16–17 (2015).
[Crossref]

Agnew, G.

G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonić, P. Dean, A. Valavanis, D. Indjin, and A. D. Rakić, “Frequency tuning range control in pulsed terahertz quantum-cascade lasers: Applications in interferometry,” IEEE J. Quantum Electron. 54, 1–8 (2018).
[Crossref]

I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
[Crossref]

G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonic, P. Dean, A. Valavanis, P. Harrison, D. Indjin, and A. D. Rakic, “Temperature dependent high speed dynamics of terahertz quantum cascade lasers,” IEEE J. Sel. Top. Quantum Electron. 23, 1200209 (2017).
[Crossref]

X. Qi, G. Agnew, I. Kundu, T. Taimre, Y. L. Lim, K. Bertling, P. Dean, A. Grier, A. Valavanis, E. H. Linfield, A. G. Davies, D. Indjin, and A. D. Rakić, “Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer,” Opt. Express 25, 10153–10165 (2017).
[Crossref] [PubMed]

K. Bertling, T. Taimre, G. Agnew, Y. L. Lim, P. Dean, D. Indjin, S. Höfling, R. Weih, M. Kamp, M. von Edlinger, J. Koeth, and A. D. Rakić, “Simple electrical modulation scheme for laser feedback imaging,” IEEE J. Sensors 16, 1937–1942 (2016).
[Crossref]

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
[Crossref] [PubMed]

A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
[Crossref] [PubMed]

A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
[Crossref]

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, M. Nikolić, A. Valavanis, J. Cooper, P. Dean, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, Z. Ikonić, D. Indjin, and A. D. Rakić, “Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations,” Appl. Phys. Lett. 106, 161105 (2015).
[Crossref]

Akitegetse, C.

L. Marchese, M. Doucet, N. Blanchard, M. Leclerc, M. Terroux, M. Briand, M. Otis, M. Jacob, C. Akitegetse, H. Spisser, L. Mercier, F. Duchesne, M. Girard, L. Gagnon, M. Massicote, B. Fisette, M. Tremblay, B. Tremblay, P. Bourqui, and A. Bergeron, “Overcoming the challenges of active THz/MM-wave imaging: an optics perspective,” Proc. SPIE 10639, 106392B (2018).

Alfaro-Gomez, M.

G. Hernandez-Cardoso, S. Rojas-Landeros, M. Alfaro-Gomez, A. Hernandez-Serrano, I. Salas-Gutierrez, E. Lemus-Bedolla, A. Castillo-Guzman, H. Lopez-Lemus, and E. Castro-Camus, “Terahertz imaging for early screening of diabetic foot syndrome: A proof of concept,” Sci. Rep. 7, 42124 (2017).
[Crossref] [PubMed]

Alhathlool, R.

J. Keeley, P. Dean, A. Valavanis, K. Bertling, Y. L. Lim, R. Alhathlool, T. Taimre, L. H. Li, D. Indjin, A. D. Rakić, E. H. Linfield, and A. G. Davies, “Three-dimensional terahertz imaging using swept-frequency feedback interferometry with a quantum cascade laser,” Opt. Lett. 40, 994–997 (2015).
[Crossref] [PubMed]

P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. Lim, R. Alhathlool, A. Burnett, L. Li, S. Khanna, D. Indjin, T. Taimre, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging using quantum cascade lasers – a review of systems and applications,” J. Phys. D: Appl. Phys. 47, 374008 (2014).
[Crossref]

P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. L. Lim, R. Alhathlool, S. Chowdhury, T. Taimre, L. H. Li, D. Indjin, S. J. Wilson, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Coherent three-dimensional terahertz imaging through self-mixing in a quantum cascade laser,” Appl. Phys. Lett. 103, 181112 (2013).
[Crossref]

Amanti, M. I.

Anders, W.

M. Wienold, L. Schrottke, M. Giehler, R. Hey, W. Anders, and H. T. Grahn, “Low-voltage terahertz quantum-cascade lasers based on LO-phonon-assisted interminiband transitions,” Electron. Lett. 45, 1030–1031 (2009).
[Crossref]

Appleby, R.

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G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonić, P. Dean, A. Valavanis, D. Indjin, and A. D. Rakić, “Frequency tuning range control in pulsed terahertz quantum-cascade lasers: Applications in interferometry,” IEEE J. Quantum Electron. 54, 1–8 (2018).
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K. Bertling, T. Taimre, G. Agnew, Y. L. Lim, P. Dean, D. Indjin, S. Höfling, R. Weih, M. Kamp, M. von Edlinger, J. Koeth, and A. D. Rakić, “Simple electrical modulation scheme for laser feedback imaging,” IEEE J. Sensors 16, 1937–1942 (2016).
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A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
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Y. L. Lim, T. Taimre, K. Bertling, P. Dean, D. Indjin, S. P. Khanna, A. Valavanis, M. Lachab, H. Schaider, T. W. Prow, H. P. Soyer, E. H. Linfield, A. G. Davies, and A. D. Rakic, “High-contrast coherent terahertz imaging of porcine tissue via swept-frequency feedback interferometry,” Biomed. Opt. Express 5, 3981–3989 (2014).
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P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. Lim, R. Alhathlool, A. Burnett, L. Li, S. Khanna, D. Indjin, T. Taimre, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging using quantum cascade lasers – a review of systems and applications,” J. Phys. D: Appl. Phys. 47, 374008 (2014).
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Booske, J.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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Brambilla, M.

F. P. Mezzapesa, L. L. Columbo, C. Rizza, M. Brambilla, A. Ciattoni, M. Dabbicco, M. S. Vitiello, and G. Scamarcio, “Photo-generated metamaterials induce modulation of CW terahertz quantum cascade lasers,” Sci. Rep. 5, 16207 (2015).
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Burnett, A.

P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. Lim, R. Alhathlool, A. Burnett, L. Li, S. Khanna, D. Indjin, T. Taimre, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging using quantum cascade lasers – a review of systems and applications,” J. Phys. D: Appl. Phys. 47, 374008 (2014).
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Chattopadhyay, G.

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F. P. Mezzapesa, L. L. Columbo, C. Rizza, M. Brambilla, A. Ciattoni, M. Dabbicco, M. S. Vitiello, and G. Scamarcio, “Photo-generated metamaterials induce modulation of CW terahertz quantum cascade lasers,” Sci. Rep. 5, 16207 (2015).
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M. Locatelli, M. Ravaro, S. Bartalini, L. Consolino, M. S. Vitiello, R. Cicchi, F. Pavone, and P. De Natale, “Real-time terahertz digital holography with a quantum cascade laser,” Sci. Rep. 5, 13566 (2015).
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S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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Columbo, L. L.

F. P. Mezzapesa, L. L. Columbo, C. Rizza, M. Brambilla, A. Ciattoni, M. Dabbicco, M. S. Vitiello, and G. Scamarcio, “Photo-generated metamaterials induce modulation of CW terahertz quantum cascade lasers,” Sci. Rep. 5, 16207 (2015).
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M. Locatelli, M. Ravaro, S. Bartalini, L. Consolino, M. S. Vitiello, R. Cicchi, F. Pavone, and P. De Natale, “Real-time terahertz digital holography with a quantum cascade laser,” Sci. Rep. 5, 13566 (2015).
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G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
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Cooper, K. B.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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K. B. Cooper, R. J. Dengler, N. Llombart, B. Thomas, G. Chattopadhyay, and P. H. Siegel, “THz imaging radar for standoff personnel screening,” IEEE Trans. THz Sci. Technol. 1, 169–182 (2011).
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Cumming, D. R. S.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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Cunningham, J. E.

I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
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S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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Dabbicco, M.

F. P. Mezzapesa, L. L. Columbo, C. Rizza, M. Brambilla, A. Ciattoni, M. Dabbicco, M. S. Vitiello, and G. Scamarcio, “Photo-generated metamaterials induce modulation of CW terahertz quantum cascade lasers,” Sci. Rep. 5, 16207 (2015).
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F. Mezzapesa, L. Columbo, M. Brambilla, M. Dabbicco, M. Vitiello, and G. Scamarcio, “Imaging of free carriers in semiconductors via optical feedback in terahertz quantum cascade lasers,” Appl. Phys. Lett. 104, 041112 (2014).
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F. Mezzapesa, M. Petruzzella, M. Dabbicco, H. Beere, D. Ritchie, M. Vitiello, and G. Scamarcio, “Continuous-wave reflection imaging using optical feedback interferometry in terahertz and mid-infrared quantum cascade lasers,” IEEE Trans. Terahertz Sci. Tech. 4, 631–633 (2014).
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Davies, A. G.

K. Bertling, S. Han, T. Wu, C. Zhao, Y. L. Lim, P. Dean, S. P. Khanna, D. Indjin, E. H. Linfield, A. G. Davies, S. J. Wilson, T. Taimre, and A. D. Rakić, “Determining ethanol content of liquid solutions using laser feedback interferometry with a terahertz quantum cascade laser,” IEEE Sens. Lett. 2, 1–4 (2018).
[Crossref]

I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
[Crossref]

L. H. Li, L. Chen, J. R. Freeman, M. Salih, P. Dean, A. G. Davies, and E. H. Linfield, “Multi-watt high-power THz frequency quantum cascade lasers,” Electron. Lett. 53, 799–800 (2017).
[Crossref]

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
[Crossref]

X. Qi, G. Agnew, I. Kundu, T. Taimre, Y. L. Lim, K. Bertling, P. Dean, A. Grier, A. Valavanis, E. H. Linfield, A. G. Davies, D. Indjin, and A. D. Rakić, “Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer,” Opt. Express 25, 10153–10165 (2017).
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A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
[Crossref]

S. Han, K. Bertling, P. Dean, J. Keeley, A. D. Burnett, Y. L. Lim, S. P. Khanna, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, T. Taimre, and A. D. Rakic, “Laser feedback interferometry as a tool for analysis of compound mixtures at terahertz frequencies: towards imaging and identification of plastic explosives,” Sensors 16, 352 (2016).
[Crossref]

P. Dean, O. Mitrofanov, J. Keeley, I. Kundu, L. Li, E. H. Linfield, and A. G. Davies, “Apertureless near-field terahertz imaging using the self-mixing effect in a quantum cascade laser,” Appl. Phys. Lett. 108, 091113 (2016).
[Crossref]

A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
[Crossref] [PubMed]

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
[Crossref] [PubMed]

J. Keeley, P. Dean, A. Valavanis, K. Bertling, Y. L. Lim, R. Alhathlool, T. Taimre, L. H. Li, D. Indjin, A. D. Rakić, E. H. Linfield, and A. G. Davies, “Three-dimensional terahertz imaging using swept-frequency feedback interferometry with a quantum cascade laser,” Opt. Lett. 40, 994–997 (2015).
[Crossref] [PubMed]

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, M. Nikolić, A. Valavanis, J. Cooper, P. Dean, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, Z. Ikonić, D. Indjin, and A. D. Rakić, “Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations,” Appl. Phys. Lett. 106, 161105 (2015).
[Crossref]

Y. L. Lim, T. Taimre, K. Bertling, P. Dean, D. Indjin, S. P. Khanna, A. Valavanis, M. Lachab, H. Schaider, T. W. Prow, H. P. Soyer, E. H. Linfield, A. G. Davies, and A. D. Rakic, “High-contrast coherent terahertz imaging of porcine tissue via swept-frequency feedback interferometry,” Biomed. Opt. Express 5, 3981–3989 (2014).
[Crossref] [PubMed]

H. S. Lui, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, and A. D. Rakic, “Terahertz inverse synthetic aperture radar imaging using self-mixing interferometry with a quantum cascade laser,” Opt. Lett. 39, 2629–2632 (2014).
[Crossref] [PubMed]

P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. Lim, R. Alhathlool, A. Burnett, L. Li, S. Khanna, D. Indjin, T. Taimre, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging using quantum cascade lasers – a review of systems and applications,” J. Phys. D: Appl. Phys. 47, 374008 (2014).
[Crossref]

A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, S. J. Wilson, M. Nikolic, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, B. Ferguson, G. Walker, H. Schaider, and H. P. Soyer, “THz QCL self-mixing interferometry for biomedical applications,” Proc. SPIE 9199, 9199M (2014).

L. Li, L. Chen, J. Zhu, J. Freeman, P. Dean, A. Valavanis, A. G. Davies, and E. H. Linfield, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50, 309–311 (2014).
[Crossref]

P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. L. Lim, R. Alhathlool, S. Chowdhury, T. Taimre, L. H. Li, D. Indjin, S. J. Wilson, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Coherent three-dimensional terahertz imaging through self-mixing in a quantum cascade laser,” Appl. Phys. Lett. 103, 181112 (2013).
[Crossref]

A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, Z. Ikonic, P. Harrison, A. Valavanis, S. P. Khanna, M. Lachab, S. J. Wilson, E. H. Linfield, and A. G. Davies, “Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis,” Opt. Express 21, 22194–22205 (2013).
[Crossref] [PubMed]

P. Dean, Y. L. Lim, A. Valavanis, S. P. Khanna, M. Lachab, R. Kliese, M. Nikolic, Z. Ikonic, D. Indjin, P. Harrison, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging through self-mixing in a quantum cascade laser,” Opt. Lett. 36, 2587–2589 (2011).
[Crossref] [PubMed]

Y. L. Lim, P. Dean, M. Nikolic, R. Kliese, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, Z. Ikonic, P. Harrison, E. H. Linfield, A. G. Davies, S. J. Wilson, and A. D. Rakic, “Demonstration of a self-mixing displacement sensor based on THz quantum cascade lasers,” Appl. Phys. Lett. 99, 081108 (2011).
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De Natale, P.

M. S. Vitiello, G. Scalari, B. Williams, and P. De Natale, “Quantum cascade lasers: 20 years of challenges,” Opt. Express 23, 5167–5182 (2015).
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M. Locatelli, M. Ravaro, S. Bartalini, L. Consolino, M. S. Vitiello, R. Cicchi, F. Pavone, and P. De Natale, “Real-time terahertz digital holography with a quantum cascade laser,” Sci. Rep. 5, 13566 (2015).
[Crossref] [PubMed]

Dean, P.

K. Bertling, S. Han, T. Wu, C. Zhao, Y. L. Lim, P. Dean, S. P. Khanna, D. Indjin, E. H. Linfield, A. G. Davies, S. J. Wilson, T. Taimre, and A. D. Rakić, “Determining ethanol content of liquid solutions using laser feedback interferometry with a terahertz quantum cascade laser,” IEEE Sens. Lett. 2, 1–4 (2018).
[Crossref]

G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonić, P. Dean, A. Valavanis, D. Indjin, and A. D. Rakić, “Frequency tuning range control in pulsed terahertz quantum-cascade lasers: Applications in interferometry,” IEEE J. Quantum Electron. 54, 1–8 (2018).
[Crossref]

I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
[Crossref]

G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonic, P. Dean, A. Valavanis, P. Harrison, D. Indjin, and A. D. Rakic, “Temperature dependent high speed dynamics of terahertz quantum cascade lasers,” IEEE J. Sel. Top. Quantum Electron. 23, 1200209 (2017).
[Crossref]

L. H. Li, L. Chen, J. R. Freeman, M. Salih, P. Dean, A. G. Davies, and E. H. Linfield, “Multi-watt high-power THz frequency quantum cascade lasers,” Electron. Lett. 53, 799–800 (2017).
[Crossref]

X. Qi, G. Agnew, I. Kundu, T. Taimre, Y. L. Lim, K. Bertling, P. Dean, A. Grier, A. Valavanis, E. H. Linfield, A. G. Davies, D. Indjin, and A. D. Rakić, “Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer,” Opt. Express 25, 10153–10165 (2017).
[Crossref] [PubMed]

S. Han, K. Bertling, P. Dean, J. Keeley, A. D. Burnett, Y. L. Lim, S. P. Khanna, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, T. Taimre, and A. D. Rakic, “Laser feedback interferometry as a tool for analysis of compound mixtures at terahertz frequencies: towards imaging and identification of plastic explosives,” Sensors 16, 352 (2016).
[Crossref]

P. Dean, O. Mitrofanov, J. Keeley, I. Kundu, L. Li, E. H. Linfield, and A. G. Davies, “Apertureless near-field terahertz imaging using the self-mixing effect in a quantum cascade laser,” Appl. Phys. Lett. 108, 091113 (2016).
[Crossref]

K. Bertling, T. Taimre, G. Agnew, Y. L. Lim, P. Dean, D. Indjin, S. Höfling, R. Weih, M. Kamp, M. von Edlinger, J. Koeth, and A. D. Rakić, “Simple electrical modulation scheme for laser feedback imaging,” IEEE J. Sensors 16, 1937–1942 (2016).
[Crossref]

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
[Crossref] [PubMed]

A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
[Crossref] [PubMed]

J. Keeley, P. Dean, A. Valavanis, K. Bertling, Y. L. Lim, R. Alhathlool, T. Taimre, L. H. Li, D. Indjin, A. D. Rakić, E. H. Linfield, and A. G. Davies, “Three-dimensional terahertz imaging using swept-frequency feedback interferometry with a quantum cascade laser,” Opt. Lett. 40, 994–997 (2015).
[Crossref] [PubMed]

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, M. Nikolić, A. Valavanis, J. Cooper, P. Dean, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, Z. Ikonić, D. Indjin, and A. D. Rakić, “Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations,” Appl. Phys. Lett. 106, 161105 (2015).
[Crossref]

Y. L. Lim, T. Taimre, K. Bertling, P. Dean, D. Indjin, S. P. Khanna, A. Valavanis, M. Lachab, H. Schaider, T. W. Prow, H. P. Soyer, E. H. Linfield, A. G. Davies, and A. D. Rakic, “High-contrast coherent terahertz imaging of porcine tissue via swept-frequency feedback interferometry,” Biomed. Opt. Express 5, 3981–3989 (2014).
[Crossref] [PubMed]

H. S. Lui, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, and A. D. Rakic, “Terahertz inverse synthetic aperture radar imaging using self-mixing interferometry with a quantum cascade laser,” Opt. Lett. 39, 2629–2632 (2014).
[Crossref] [PubMed]

T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, and A. D. Rakić, “Methodology for materials analysis using swept-frequency feedback interferometry with terahertz frequency quantum cascade lasers,” Opt. Express 22, 18633–18647 (2014).
[Crossref] [PubMed]

P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. Lim, R. Alhathlool, A. Burnett, L. Li, S. Khanna, D. Indjin, T. Taimre, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging using quantum cascade lasers – a review of systems and applications,” J. Phys. D: Appl. Phys. 47, 374008 (2014).
[Crossref]

L. Li, L. Chen, J. Zhu, J. Freeman, P. Dean, A. Valavanis, A. G. Davies, and E. H. Linfield, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50, 309–311 (2014).
[Crossref]

P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. L. Lim, R. Alhathlool, S. Chowdhury, T. Taimre, L. H. Li, D. Indjin, S. J. Wilson, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Coherent three-dimensional terahertz imaging through self-mixing in a quantum cascade laser,” Appl. Phys. Lett. 103, 181112 (2013).
[Crossref]

A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, Z. Ikonic, P. Harrison, A. Valavanis, S. P. Khanna, M. Lachab, S. J. Wilson, E. H. Linfield, and A. G. Davies, “Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis,” Opt. Express 21, 22194–22205 (2013).
[Crossref] [PubMed]

P. Dean, Y. L. Lim, A. Valavanis, S. P. Khanna, M. Lachab, R. Kliese, M. Nikolic, Z. Ikonic, D. Indjin, P. Harrison, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging through self-mixing in a quantum cascade laser,” Opt. Lett. 36, 2587–2589 (2011).
[Crossref] [PubMed]

Y. L. Lim, P. Dean, M. Nikolic, R. Kliese, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, Z. Ikonic, P. Harrison, E. H. Linfield, A. G. Davies, S. J. Wilson, and A. D. Rakic, “Demonstration of a self-mixing displacement sensor based on THz quantum cascade lasers,” Appl. Phys. Lett. 99, 081108 (2011).
[Crossref]

Degl’Innocenti, R.

Y. Ren, R. Wallis, D. S. Jessop, R. Degl’Innocenti, A. Klimont, H. E. Beere, and D. A. Ritchie, “Fast terahertz imaging using a quantum cascade amplifier,” Appl. Phys. Lett. 107, 011107 (2015).
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A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
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K. B. Cooper, R. J. Dengler, N. Llombart, B. Thomas, G. Chattopadhyay, and P. H. Siegel, “THz imaging radar for standoff personnel screening,” IEEE Trans. THz Sci. Technol. 1, 169–182 (2011).
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Dhillon, S. S.

I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
[Crossref]

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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L. Marchese, M. Doucet, N. Blanchard, M. Leclerc, M. Terroux, M. Briand, M. Otis, M. Jacob, C. Akitegetse, H. Spisser, L. Mercier, F. Duchesne, M. Girard, L. Gagnon, M. Massicote, B. Fisette, M. Tremblay, B. Tremblay, P. Bourqui, and A. Bergeron, “Overcoming the challenges of active THz/MM-wave imaging: an optics perspective,” Proc. SPIE 10639, 106392B (2018).

Duchesne, F.

L. Marchese, M. Doucet, N. Blanchard, M. Leclerc, M. Terroux, M. Briand, M. Otis, M. Jacob, C. Akitegetse, H. Spisser, L. Mercier, F. Duchesne, M. Girard, L. Gagnon, M. Massicote, B. Fisette, M. Tremblay, B. Tremblay, P. Bourqui, and A. Bergeron, “Overcoming the challenges of active THz/MM-wave imaging: an optics perspective,” Proc. SPIE 10639, 106392B (2018).

Eichholz, R.

H.-W. Hübers, H. Richter, R. Eichholz, M. Wienold, K. Biermann, L. Schrottke, and H. Grahn, “Heterodyne spectroscopy of frequency instabilities in terahertz quantum-cascade lasers induced by optical feedback,” IEEE J. Sel. Top. Quantum Electron. 23, 1800306 (2017).
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S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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Fan, S.

C. Yu, S. Fan, Y. Sun, and E. Pickwell-MacPherson, “The potential of terahertz imaging for cancer diagnosis: A review of investigations to date,” Quant. Imaging Med. Surg. 2, 33–45 (2012).
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A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
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A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, S. J. Wilson, M. Nikolic, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, B. Ferguson, G. Walker, H. Schaider, and H. P. Soyer, “THz QCL self-mixing interferometry for biomedical applications,” Proc. SPIE 9199, 9199M (2014).

Fice, M.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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L. Marchese, M. Doucet, N. Blanchard, M. Leclerc, M. Terroux, M. Briand, M. Otis, M. Jacob, C. Akitegetse, H. Spisser, L. Mercier, F. Duchesne, M. Girard, L. Gagnon, M. Massicote, B. Fisette, M. Tremblay, B. Tremblay, P. Bourqui, and A. Bergeron, “Overcoming the challenges of active THz/MM-wave imaging: an optics perspective,” Proc. SPIE 10639, 106392B (2018).

Forster, W.

R. A. Hadi, H. Sherry, J. Grzyb, Y. Zhao, W. Forster, H. M. Keller, A. Cathelin, A. Kaiser, and U. R. Pfeiffer, “A 1 k-pixel video camera for 0.7 – 1.1 terahertz imaging applications in 65-nm CMOS,” IEEE J. Solid-State Circuits 47, 2999–3012 (2012).
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Freeman, J.

I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
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L. Li, L. Chen, J. Zhu, J. Freeman, P. Dean, A. Valavanis, A. G. Davies, and E. H. Linfield, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50, 309–311 (2014).
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Freeman, J. R.

L. H. Li, L. Chen, J. R. Freeman, M. Salih, P. Dean, A. G. Davies, and E. H. Linfield, “Multi-watt high-power THz frequency quantum cascade lasers,” Electron. Lett. 53, 799–800 (2017).
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F. Qiu, Z. Tan, Z. Fu, W. Wan, M. Li, C. Wang, and J. Cao, “Reflective scanning imaging based on a fast terahertz photodetector,” Opt. Commun. 427, 170–174 (2018).
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R. Fukasawa, “Terahertz imaging: Widespread industrial application in non-destructive inspection and chemical analysis,” IEEE Trans. THz Sci. Technol. 5, 1121–1127 (2015).

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L. Marchese, M. Doucet, N. Blanchard, M. Leclerc, M. Terroux, M. Briand, M. Otis, M. Jacob, C. Akitegetse, H. Spisser, L. Mercier, F. Duchesne, M. Girard, L. Gagnon, M. Massicote, B. Fisette, M. Tremblay, B. Tremblay, P. Bourqui, and A. Bergeron, “Overcoming the challenges of active THz/MM-wave imaging: an optics perspective,” Proc. SPIE 10639, 106392B (2018).

Gäumann, G.

E. Hack, L. Valzania, G. Gäumann, M. Shalaby, C. P. Hauri, and P. Zolliker, “Comparison of thermal detector arrays for off-axis THz holography and real-time THz imaging,” Sensors 16, 221 (2016).
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Gensch, M.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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Giehler, M.

M. Wienold, L. Schrottke, M. Giehler, R. Hey, W. Anders, and H. T. Grahn, “Low-voltage terahertz quantum-cascade lasers based on LO-phonon-assisted interminiband transitions,” Electron. Lett. 45, 1030–1031 (2009).
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Girard, M.

L. Marchese, M. Doucet, N. Blanchard, M. Leclerc, M. Terroux, M. Briand, M. Otis, M. Jacob, C. Akitegetse, H. Spisser, L. Mercier, F. Duchesne, M. Girard, L. Gagnon, M. Massicote, B. Fisette, M. Tremblay, B. Tremblay, P. Bourqui, and A. Bergeron, “Overcoming the challenges of active THz/MM-wave imaging: an optics perspective,” Proc. SPIE 10639, 106392B (2018).

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G. Giuliani, M. Norgia, S. Donati, and T. Bosch, “Laser diode self-mixing technique for sensing applications,” J. Opt. A: Pure Appl. Opt. 4, S283 (2002).
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Goldsmith, P.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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Grahn, H.

H.-W. Hübers, H. Richter, R. Eichholz, M. Wienold, K. Biermann, L. Schrottke, and H. Grahn, “Heterodyne spectroscopy of frequency instabilities in terahertz quantum-cascade lasers induced by optical feedback,” IEEE J. Sel. Top. Quantum Electron. 23, 1800306 (2017).
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M. Wienold, T. Hagelschuer, N. Rothbart, L. Schrottke, K. Biermann, H. Grahn, and H.-W. Hübers, “Real-time terahertz imaging through self-mixing in a quantum-cascade laser,” Appl. Phys. Lett. 109, 011102 (2016).
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Grahn, H. T.

T. Hagelschuer, M. Wienold, H. Richter, L. Schrottke, K. Biermann, H. T. Grahn, and H.-W. Hübers, “Terahertz gas spectroscopy through self-mixing in a quantum-cascade laser,” Appl. Phys. Lett. 109, 191101 (2016).
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M. Wienold, L. Schrottke, M. Giehler, R. Hey, W. Anders, and H. T. Grahn, “Low-voltage terahertz quantum-cascade lasers based on LO-phonon-assisted interminiband transitions,” Electron. Lett. 45, 1030–1031 (2009).
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Grant, J.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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Grier, A.

I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
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G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonić, P. Dean, A. Valavanis, D. Indjin, and A. D. Rakić, “Frequency tuning range control in pulsed terahertz quantum-cascade lasers: Applications in interferometry,” IEEE J. Quantum Electron. 54, 1–8 (2018).
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G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonic, P. Dean, A. Valavanis, P. Harrison, D. Indjin, and A. D. Rakic, “Temperature dependent high speed dynamics of terahertz quantum cascade lasers,” IEEE J. Sel. Top. Quantum Electron. 23, 1200209 (2017).
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X. Qi, G. Agnew, I. Kundu, T. Taimre, Y. L. Lim, K. Bertling, P. Dean, A. Grier, A. Valavanis, E. H. Linfield, A. G. Davies, D. Indjin, and A. D. Rakić, “Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer,” Opt. Express 25, 10153–10165 (2017).
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A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
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G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
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A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
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G. Agnew, A. Grier, T. Taimre, Y. L. Lim, M. Nikolić, A. Valavanis, J. Cooper, P. Dean, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, Z. Ikonić, D. Indjin, and A. D. Rakić, “Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations,” Appl. Phys. Lett. 106, 161105 (2015).
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Grzyb, J.

R. A. Hadi, H. Sherry, J. Grzyb, Y. Zhao, W. Forster, H. M. Keller, A. Cathelin, A. Kaiser, and U. R. Pfeiffer, “A 1 k-pixel video camera for 0.7 – 1.1 terahertz imaging applications in 65-nm CMOS,” IEEE J. Solid-State Circuits 47, 2999–3012 (2012).
[Crossref]

Guerboukha, H.

Hack, E.

L. Valzania, P. Zolliker, and E. Hack, “Topography of hidden objects using THz digital holography with multi-beam interferences,” Opt. Express 25, 11038–11047 (2017).
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E. Hack, L. Valzania, G. Gäumann, M. Shalaby, C. P. Hauri, and P. Zolliker, “Comparison of thermal detector arrays for off-axis THz holography and real-time THz imaging,” Sensors 16, 221 (2016).
[Crossref] [PubMed]

Hadi, R. A.

R. A. Hadi, H. Sherry, J. Grzyb, Y. Zhao, W. Forster, H. M. Keller, A. Cathelin, A. Kaiser, and U. R. Pfeiffer, “A 1 k-pixel video camera for 0.7 – 1.1 terahertz imaging applications in 65-nm CMOS,” IEEE J. Solid-State Circuits 47, 2999–3012 (2012).
[Crossref]

Hagelschuer, T.

M. Wienold, T. Hagelschuer, N. Rothbart, L. Schrottke, K. Biermann, H. Grahn, and H.-W. Hübers, “Real-time terahertz imaging through self-mixing in a quantum-cascade laser,” Appl. Phys. Lett. 109, 011102 (2016).
[Crossref]

T. Hagelschuer, M. Wienold, H. Richter, L. Schrottke, K. Biermann, H. T. Grahn, and H.-W. Hübers, “Terahertz gas spectroscopy through self-mixing in a quantum-cascade laser,” Appl. Phys. Lett. 109, 191101 (2016).
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Han, S.

K. Bertling, S. Han, T. Wu, C. Zhao, Y. L. Lim, P. Dean, S. P. Khanna, D. Indjin, E. H. Linfield, A. G. Davies, S. J. Wilson, T. Taimre, and A. D. Rakić, “Determining ethanol content of liquid solutions using laser feedback interferometry with a terahertz quantum cascade laser,” IEEE Sens. Lett. 2, 1–4 (2018).
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S. Han, K. Bertling, P. Dean, J. Keeley, A. D. Burnett, Y. L. Lim, S. P. Khanna, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, T. Taimre, and A. D. Rakic, “Laser feedback interferometry as a tool for analysis of compound mixtures at terahertz frequencies: towards imaging and identification of plastic explosives,” Sensors 16, 352 (2016).
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A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
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Harrison, P.

G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonic, P. Dean, A. Valavanis, P. Harrison, D. Indjin, and A. D. Rakic, “Temperature dependent high speed dynamics of terahertz quantum cascade lasers,” IEEE J. Sel. Top. Quantum Electron. 23, 1200209 (2017).
[Crossref]

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
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A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
[Crossref] [PubMed]

A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
[Crossref]

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, M. Nikolić, A. Valavanis, J. Cooper, P. Dean, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, Z. Ikonić, D. Indjin, and A. D. Rakić, “Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations,” Appl. Phys. Lett. 106, 161105 (2015).
[Crossref]

A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, Z. Ikonic, P. Harrison, A. Valavanis, S. P. Khanna, M. Lachab, S. J. Wilson, E. H. Linfield, and A. G. Davies, “Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis,” Opt. Express 21, 22194–22205 (2013).
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P. Dean, Y. L. Lim, A. Valavanis, S. P. Khanna, M. Lachab, R. Kliese, M. Nikolic, Z. Ikonic, D. Indjin, P. Harrison, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging through self-mixing in a quantum cascade laser,” Opt. Lett. 36, 2587–2589 (2011).
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Y. L. Lim, P. Dean, M. Nikolic, R. Kliese, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, Z. Ikonic, P. Harrison, E. H. Linfield, A. G. Davies, S. J. Wilson, and A. D. Rakic, “Demonstration of a self-mixing displacement sensor based on THz quantum cascade lasers,” Appl. Phys. Lett. 99, 081108 (2011).
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Hauri, C. P.

E. Hack, L. Valzania, G. Gäumann, M. Shalaby, C. P. Hauri, and P. Zolliker, “Comparison of thermal detector arrays for off-axis THz holography and real-time THz imaging,” Sensors 16, 221 (2016).
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Hayashi, A.

Hernandez-Cardoso, G.

G. Hernandez-Cardoso, S. Rojas-Landeros, M. Alfaro-Gomez, A. Hernandez-Serrano, I. Salas-Gutierrez, E. Lemus-Bedolla, A. Castillo-Guzman, H. Lopez-Lemus, and E. Castro-Camus, “Terahertz imaging for early screening of diabetic foot syndrome: A proof of concept,” Sci. Rep. 7, 42124 (2017).
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Hernandez-Serrano, A.

G. Hernandez-Cardoso, S. Rojas-Landeros, M. Alfaro-Gomez, A. Hernandez-Serrano, I. Salas-Gutierrez, E. Lemus-Bedolla, A. Castillo-Guzman, H. Lopez-Lemus, and E. Castro-Camus, “Terahertz imaging for early screening of diabetic foot syndrome: A proof of concept,” Sci. Rep. 7, 42124 (2017).
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Hey, R.

M. Wienold, L. Schrottke, M. Giehler, R. Hey, W. Anders, and H. T. Grahn, “Low-voltage terahertz quantum-cascade lasers based on LO-phonon-assisted interminiband transitions,” Electron. Lett. 45, 1030–1031 (2009).
[Crossref]

Hoffmann, M. C.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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Höfling, S.

K. Bertling, T. Taimre, G. Agnew, Y. L. Lim, P. Dean, D. Indjin, S. Höfling, R. Weih, M. Kamp, M. von Edlinger, J. Koeth, and A. D. Rakić, “Simple electrical modulation scheme for laser feedback imaging,” IEEE J. Sensors 16, 1937–1942 (2016).
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Hoshina, H.

Hu, Q.

A. W. M. Lee, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Real-time imaging using a 4.3-THz quantum cascade laser and a 320 × 240 microbolometer focal-plane array,” IEEE Photon. Technol. Lett. 18, 1415–1417 (2006).
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A. W. Lee and Q. Hu, “Real-time, continuous-wave terahertz imaging by use of a microbolometer focal-plane array,” Opt. Lett. 30, 2563–2565 (2005).
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Hübers, H.-W.

H.-W. Hübers, H. Richter, R. Eichholz, M. Wienold, K. Biermann, L. Schrottke, and H. Grahn, “Heterodyne spectroscopy of frequency instabilities in terahertz quantum-cascade lasers induced by optical feedback,” IEEE J. Sel. Top. Quantum Electron. 23, 1800306 (2017).
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T. Hagelschuer, M. Wienold, H. Richter, L. Schrottke, K. Biermann, H. T. Grahn, and H.-W. Hübers, “Terahertz gas spectroscopy through self-mixing in a quantum-cascade laser,” Appl. Phys. Lett. 109, 191101 (2016).
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S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonić, P. Dean, A. Valavanis, D. Indjin, and A. D. Rakić, “Frequency tuning range control in pulsed terahertz quantum-cascade lasers: Applications in interferometry,” IEEE J. Quantum Electron. 54, 1–8 (2018).
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G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonic, P. Dean, A. Valavanis, P. Harrison, D. Indjin, and A. D. Rakic, “Temperature dependent high speed dynamics of terahertz quantum cascade lasers,” IEEE J. Sel. Top. Quantum Electron. 23, 1200209 (2017).
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G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
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A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
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A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
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G. Agnew, A. Grier, T. Taimre, Y. L. Lim, M. Nikolić, A. Valavanis, J. Cooper, P. Dean, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, Z. Ikonić, D. Indjin, and A. D. Rakić, “Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations,” Appl. Phys. Lett. 106, 161105 (2015).
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A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, Z. Ikonic, P. Harrison, A. Valavanis, S. P. Khanna, M. Lachab, S. J. Wilson, E. H. Linfield, and A. G. Davies, “Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis,” Opt. Express 21, 22194–22205 (2013).
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P. Dean, Y. L. Lim, A. Valavanis, S. P. Khanna, M. Lachab, R. Kliese, M. Nikolic, Z. Ikonic, D. Indjin, P. Harrison, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging through self-mixing in a quantum cascade laser,” Opt. Lett. 36, 2587–2589 (2011).
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Y. L. Lim, P. Dean, M. Nikolic, R. Kliese, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, Z. Ikonic, P. Harrison, E. H. Linfield, A. G. Davies, S. J. Wilson, and A. D. Rakic, “Demonstration of a self-mixing displacement sensor based on THz quantum cascade lasers,” Appl. Phys. Lett. 99, 081108 (2011).
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Indjin, D.

G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonić, P. Dean, A. Valavanis, D. Indjin, and A. D. Rakić, “Frequency tuning range control in pulsed terahertz quantum-cascade lasers: Applications in interferometry,” IEEE J. Quantum Electron. 54, 1–8 (2018).
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I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
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K. Bertling, S. Han, T. Wu, C. Zhao, Y. L. Lim, P. Dean, S. P. Khanna, D. Indjin, E. H. Linfield, A. G. Davies, S. J. Wilson, T. Taimre, and A. D. Rakić, “Determining ethanol content of liquid solutions using laser feedback interferometry with a terahertz quantum cascade laser,” IEEE Sens. Lett. 2, 1–4 (2018).
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G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonic, P. Dean, A. Valavanis, P. Harrison, D. Indjin, and A. D. Rakic, “Temperature dependent high speed dynamics of terahertz quantum cascade lasers,” IEEE J. Sel. Top. Quantum Electron. 23, 1200209 (2017).
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X. Qi, G. Agnew, I. Kundu, T. Taimre, Y. L. Lim, K. Bertling, P. Dean, A. Grier, A. Valavanis, E. H. Linfield, A. G. Davies, D. Indjin, and A. D. Rakić, “Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer,” Opt. Express 25, 10153–10165 (2017).
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K. Bertling, T. Taimre, G. Agnew, Y. L. Lim, P. Dean, D. Indjin, S. Höfling, R. Weih, M. Kamp, M. von Edlinger, J. Koeth, and A. D. Rakić, “Simple electrical modulation scheme for laser feedback imaging,” IEEE J. Sensors 16, 1937–1942 (2016).
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G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
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A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
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S. Han, K. Bertling, P. Dean, J. Keeley, A. D. Burnett, Y. L. Lim, S. P. Khanna, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, T. Taimre, and A. D. Rakic, “Laser feedback interferometry as a tool for analysis of compound mixtures at terahertz frequencies: towards imaging and identification of plastic explosives,” Sensors 16, 352 (2016).
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A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
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J. Keeley, P. Dean, A. Valavanis, K. Bertling, Y. L. Lim, R. Alhathlool, T. Taimre, L. H. Li, D. Indjin, A. D. Rakić, E. H. Linfield, and A. G. Davies, “Three-dimensional terahertz imaging using swept-frequency feedback interferometry with a quantum cascade laser,” Opt. Lett. 40, 994–997 (2015).
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G. Agnew, A. Grier, T. Taimre, Y. L. Lim, M. Nikolić, A. Valavanis, J. Cooper, P. Dean, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, Z. Ikonić, D. Indjin, and A. D. Rakić, “Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations,” Appl. Phys. Lett. 106, 161105 (2015).
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Y. L. Lim, T. Taimre, K. Bertling, P. Dean, D. Indjin, S. P. Khanna, A. Valavanis, M. Lachab, H. Schaider, T. W. Prow, H. P. Soyer, E. H. Linfield, A. G. Davies, and A. D. Rakic, “High-contrast coherent terahertz imaging of porcine tissue via swept-frequency feedback interferometry,” Biomed. Opt. Express 5, 3981–3989 (2014).
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T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, and A. D. Rakić, “Methodology for materials analysis using swept-frequency feedback interferometry with terahertz frequency quantum cascade lasers,” Opt. Express 22, 18633–18647 (2014).
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H. S. Lui, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, and A. D. Rakic, “Terahertz inverse synthetic aperture radar imaging using self-mixing interferometry with a quantum cascade laser,” Opt. Lett. 39, 2629–2632 (2014).
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A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, S. J. Wilson, M. Nikolic, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, B. Ferguson, G. Walker, H. Schaider, and H. P. Soyer, “THz QCL self-mixing interferometry for biomedical applications,” Proc. SPIE 9199, 9199M (2014).

P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. Lim, R. Alhathlool, A. Burnett, L. Li, S. Khanna, D. Indjin, T. Taimre, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging using quantum cascade lasers – a review of systems and applications,” J. Phys. D: Appl. Phys. 47, 374008 (2014).
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P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. L. Lim, R. Alhathlool, S. Chowdhury, T. Taimre, L. H. Li, D. Indjin, S. J. Wilson, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Coherent three-dimensional terahertz imaging through self-mixing in a quantum cascade laser,” Appl. Phys. Lett. 103, 181112 (2013).
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A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, Z. Ikonic, P. Harrison, A. Valavanis, S. P. Khanna, M. Lachab, S. J. Wilson, E. H. Linfield, and A. G. Davies, “Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis,” Opt. Express 21, 22194–22205 (2013).
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P. Dean, Y. L. Lim, A. Valavanis, S. P. Khanna, M. Lachab, R. Kliese, M. Nikolic, Z. Ikonic, D. Indjin, P. Harrison, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging through self-mixing in a quantum cascade laser,” Opt. Lett. 36, 2587–2589 (2011).
[Crossref] [PubMed]

Y. L. Lim, P. Dean, M. Nikolic, R. Kliese, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, Z. Ikonic, P. Harrison, E. H. Linfield, A. G. Davies, S. J. Wilson, and A. D. Rakic, “Demonstration of a self-mixing displacement sensor based on THz quantum cascade lasers,” Appl. Phys. Lett. 99, 081108 (2011).
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Iwata, T.

M. Yamagiwa, T. Ogawa, T. Minamikawa, D. G. Abdelsalam, K. Okabe, N. Tsurumachi, Y. Mizutani, T. Iwata, H. Yamamoto, and T. Yasui, “Real-time amplitude and phase imaging of optically opaque objects by combining full-field off-axis terahertz digital holography with angular spectrum reconstruction,” J. Infrared Millim. Terahertz Waves 39, 561–572 (2018).
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L. Marchese, M. Doucet, N. Blanchard, M. Leclerc, M. Terroux, M. Briand, M. Otis, M. Jacob, C. Akitegetse, H. Spisser, L. Mercier, F. Duchesne, M. Girard, L. Gagnon, M. Massicote, B. Fisette, M. Tremblay, B. Tremblay, P. Bourqui, and A. Bergeron, “Overcoming the challenges of active THz/MM-wave imaging: an optics perspective,” Proc. SPIE 10639, 106392B (2018).

Jansen, C.

M. Stecher, C. Jördens, N. Krumbholz, C. Jansen, M. Scheller, R. Wilk, O. Peters, B. Scherger, B. Ewers, and M. Koch, “Towards industrial inspection with THz systems,” in Ultrashort Pulse Laser Technology (Springer, 2016), pp. 311–335.
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Javed, M. U.

P. Caine, M. U. Javed, and R. O. S. Karoo, “A desmoplastic melanoma detected by an airport security scanner,” J. Plast. Reconstr. Aesthet. Surg. 69, 874–876 (2016).
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Y. Ren, R. Wallis, D. S. Jessop, R. Degl’Innocenti, A. Klimont, H. E. Beere, and D. A. Ritchie, “Fast terahertz imaging using a quantum cascade amplifier,” Appl. Phys. Lett. 107, 011107 (2015).
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S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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Jördens, C.

M. Stecher, C. Jördens, N. Krumbholz, C. Jansen, M. Scheller, R. Wilk, O. Peters, B. Scherger, B. Ewers, and M. Koch, “Towards industrial inspection with THz systems,” in Ultrashort Pulse Laser Technology (Springer, 2016), pp. 311–335.
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Kaiser, A.

R. A. Hadi, H. Sherry, J. Grzyb, Y. Zhao, W. Forster, H. M. Keller, A. Cathelin, A. Kaiser, and U. R. Pfeiffer, “A 1 k-pixel video camera for 0.7 – 1.1 terahertz imaging applications in 65-nm CMOS,” IEEE J. Solid-State Circuits 47, 2999–3012 (2012).
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Kamp, M.

K. Bertling, T. Taimre, G. Agnew, Y. L. Lim, P. Dean, D. Indjin, S. Höfling, R. Weih, M. Kamp, M. von Edlinger, J. Koeth, and A. D. Rakić, “Simple electrical modulation scheme for laser feedback imaging,” IEEE J. Sensors 16, 1937–1942 (2016).
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N. Kanda, K. Konishi, N. Nemoto, K. Midorikawa, and M. Kuwata-Gonokami, “Real-time broadband terahertz spectroscopic imaging by using a high-sensitivity terahertz camera,” Sci. Rep. 7, 42540 (2017).
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P. Caine, M. U. Javed, and R. O. S. Karoo, “A desmoplastic melanoma detected by an airport security scanner,” J. Plast. Reconstr. Aesthet. Surg. 69, 874–876 (2016).
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H.-B. Liu, H. Zhong, N. Karpowicz, Y. Chen, and X.-C. Zhang, “Terahertz spectroscopy and imaging for defense and security applications,” Proc. IEEE 95, 1514–1527 (2007).
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A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
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P. Dean, O. Mitrofanov, J. Keeley, I. Kundu, L. Li, E. H. Linfield, and A. G. Davies, “Apertureless near-field terahertz imaging using the self-mixing effect in a quantum cascade laser,” Appl. Phys. Lett. 108, 091113 (2016).
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A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
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S. Han, K. Bertling, P. Dean, J. Keeley, A. D. Burnett, Y. L. Lim, S. P. Khanna, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, T. Taimre, and A. D. Rakic, “Laser feedback interferometry as a tool for analysis of compound mixtures at terahertz frequencies: towards imaging and identification of plastic explosives,” Sensors 16, 352 (2016).
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J. Keeley, P. Dean, A. Valavanis, K. Bertling, Y. L. Lim, R. Alhathlool, T. Taimre, L. H. Li, D. Indjin, A. D. Rakić, E. H. Linfield, and A. G. Davies, “Three-dimensional terahertz imaging using swept-frequency feedback interferometry with a quantum cascade laser,” Opt. Lett. 40, 994–997 (2015).
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P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. Lim, R. Alhathlool, A. Burnett, L. Li, S. Khanna, D. Indjin, T. Taimre, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging using quantum cascade lasers – a review of systems and applications,” J. Phys. D: Appl. Phys. 47, 374008 (2014).
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P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. L. Lim, R. Alhathlool, S. Chowdhury, T. Taimre, L. H. Li, D. Indjin, S. J. Wilson, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Coherent three-dimensional terahertz imaging through self-mixing in a quantum cascade laser,” Appl. Phys. Lett. 103, 181112 (2013).
[Crossref]

Keller, H. M.

R. A. Hadi, H. Sherry, J. Grzyb, Y. Zhao, W. Forster, H. M. Keller, A. Cathelin, A. Kaiser, and U. R. Pfeiffer, “A 1 k-pixel video camera for 0.7 – 1.1 terahertz imaging applications in 65-nm CMOS,” IEEE J. Solid-State Circuits 47, 2999–3012 (2012).
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M. Kemp, “Screening mail for powders using terahertz technology,” Proc. SPIE 8189, 81890J (2011).
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P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. Lim, R. Alhathlool, A. Burnett, L. Li, S. Khanna, D. Indjin, T. Taimre, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging using quantum cascade lasers – a review of systems and applications,” J. Phys. D: Appl. Phys. 47, 374008 (2014).
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Khanna, S. P.

K. Bertling, S. Han, T. Wu, C. Zhao, Y. L. Lim, P. Dean, S. P. Khanna, D. Indjin, E. H. Linfield, A. G. Davies, S. J. Wilson, T. Taimre, and A. D. Rakić, “Determining ethanol content of liquid solutions using laser feedback interferometry with a terahertz quantum cascade laser,” IEEE Sens. Lett. 2, 1–4 (2018).
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S. Han, K. Bertling, P. Dean, J. Keeley, A. D. Burnett, Y. L. Lim, S. P. Khanna, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, T. Taimre, and A. D. Rakic, “Laser feedback interferometry as a tool for analysis of compound mixtures at terahertz frequencies: towards imaging and identification of plastic explosives,” Sensors 16, 352 (2016).
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G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
[Crossref] [PubMed]

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, M. Nikolić, A. Valavanis, J. Cooper, P. Dean, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, Z. Ikonić, D. Indjin, and A. D. Rakić, “Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations,” Appl. Phys. Lett. 106, 161105 (2015).
[Crossref]

Y. L. Lim, T. Taimre, K. Bertling, P. Dean, D. Indjin, S. P. Khanna, A. Valavanis, M. Lachab, H. Schaider, T. W. Prow, H. P. Soyer, E. H. Linfield, A. G. Davies, and A. D. Rakic, “High-contrast coherent terahertz imaging of porcine tissue via swept-frequency feedback interferometry,” Biomed. Opt. Express 5, 3981–3989 (2014).
[Crossref] [PubMed]

H. S. Lui, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, and A. D. Rakic, “Terahertz inverse synthetic aperture radar imaging using self-mixing interferometry with a quantum cascade laser,” Opt. Lett. 39, 2629–2632 (2014).
[Crossref] [PubMed]

A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, Z. Ikonic, P. Harrison, A. Valavanis, S. P. Khanna, M. Lachab, S. J. Wilson, E. H. Linfield, and A. G. Davies, “Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis,” Opt. Express 21, 22194–22205 (2013).
[Crossref] [PubMed]

P. Dean, Y. L. Lim, A. Valavanis, S. P. Khanna, M. Lachab, R. Kliese, M. Nikolic, Z. Ikonic, D. Indjin, P. Harrison, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging through self-mixing in a quantum cascade laser,” Opt. Lett. 36, 2587–2589 (2011).
[Crossref] [PubMed]

Y. L. Lim, P. Dean, M. Nikolic, R. Kliese, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, Z. Ikonic, P. Harrison, E. H. Linfield, A. G. Davies, S. J. Wilson, and A. D. Rakic, “Demonstration of a self-mixing displacement sensor based on THz quantum cascade lasers,” Appl. Phys. Lett. 99, 081108 (2011).
[Crossref]

Kliese, R.

Y. L. Lim, P. Dean, M. Nikolic, R. Kliese, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, Z. Ikonic, P. Harrison, E. H. Linfield, A. G. Davies, S. J. Wilson, and A. D. Rakic, “Demonstration of a self-mixing displacement sensor based on THz quantum cascade lasers,” Appl. Phys. Lett. 99, 081108 (2011).
[Crossref]

P. Dean, Y. L. Lim, A. Valavanis, S. P. Khanna, M. Lachab, R. Kliese, M. Nikolic, Z. Ikonic, D. Indjin, P. Harrison, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging through self-mixing in a quantum cascade laser,” Opt. Lett. 36, 2587–2589 (2011).
[Crossref] [PubMed]

Klimont, A.

Y. Ren, R. Wallis, D. S. Jessop, R. Degl’Innocenti, A. Klimont, H. E. Beere, and D. A. Ritchie, “Fast terahertz imaging using a quantum cascade amplifier,” Appl. Phys. Lett. 107, 011107 (2015).
[Crossref]

Koch, M.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
[Crossref]

M. Stecher, C. Jördens, N. Krumbholz, C. Jansen, M. Scheller, R. Wilk, O. Peters, B. Scherger, B. Ewers, and M. Koch, “Towards industrial inspection with THz systems,” in Ultrashort Pulse Laser Technology (Springer, 2016), pp. 311–335.
[Crossref]

Koeth, J.

K. Bertling, T. Taimre, G. Agnew, Y. L. Lim, P. Dean, D. Indjin, S. Höfling, R. Weih, M. Kamp, M. von Edlinger, J. Koeth, and A. D. Rakić, “Simple electrical modulation scheme for laser feedback imaging,” IEEE J. Sensors 16, 1937–1942 (2016).
[Crossref]

Konishi, K.

N. Kanda, K. Konishi, N. Nemoto, K. Midorikawa, and M. Kuwata-Gonokami, “Real-time broadband terahertz spectroscopic imaging by using a high-sensitivity terahertz camera,” Sci. Rep. 7, 42540 (2017).
[Crossref] [PubMed]

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
[Crossref]

Korter, T. M.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
[Crossref]

Krozer, V.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
[Crossref]

Krumbholz, N.

M. Stecher, C. Jördens, N. Krumbholz, C. Jansen, M. Scheller, R. Wilk, O. Peters, B. Scherger, B. Ewers, and M. Koch, “Towards industrial inspection with THz systems,” in Ultrashort Pulse Laser Technology (Springer, 2016), pp. 311–335.
[Crossref]

Kumar, S.

S. Kumar and A. W. M. Lee, “Resonant-phonon terahertz quantum-cascade lasers and video-rate terahertz imaging,” IEEE J. Sel. Top. Quantum Electron. 14, 333–344 (2008).
[Crossref]

A. W. M. Lee, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Real-time imaging using a 4.3-THz quantum cascade laser and a 320 × 240 microbolometer focal-plane array,” IEEE Photon. Technol. Lett. 18, 1415–1417 (2006).
[Crossref]

Kundu, I.

I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
[Crossref]

X. Qi, G. Agnew, I. Kundu, T. Taimre, Y. L. Lim, K. Bertling, P. Dean, A. Grier, A. Valavanis, E. H. Linfield, A. G. Davies, D. Indjin, and A. D. Rakić, “Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer,” Opt. Express 25, 10153–10165 (2017).
[Crossref] [PubMed]

P. Dean, O. Mitrofanov, J. Keeley, I. Kundu, L. Li, E. H. Linfield, and A. G. Davies, “Apertureless near-field terahertz imaging using the self-mixing effect in a quantum cascade laser,” Appl. Phys. Lett. 108, 091113 (2016).
[Crossref]

A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
[Crossref] [PubMed]

A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
[Crossref]

Kuwata-Gonokami, M.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
[Crossref]

N. Kanda, K. Konishi, N. Nemoto, K. Midorikawa, and M. Kuwata-Gonokami, “Real-time broadband terahertz spectroscopic imaging by using a high-sensitivity terahertz camera,” Sci. Rep. 7, 42540 (2017).
[Crossref] [PubMed]

Lachab, M.

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
[Crossref] [PubMed]

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, M. Nikolić, A. Valavanis, J. Cooper, P. Dean, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, Z. Ikonić, D. Indjin, and A. D. Rakić, “Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations,” Appl. Phys. Lett. 106, 161105 (2015).
[Crossref]

Y. L. Lim, T. Taimre, K. Bertling, P. Dean, D. Indjin, S. P. Khanna, A. Valavanis, M. Lachab, H. Schaider, T. W. Prow, H. P. Soyer, E. H. Linfield, A. G. Davies, and A. D. Rakic, “High-contrast coherent terahertz imaging of porcine tissue via swept-frequency feedback interferometry,” Biomed. Opt. Express 5, 3981–3989 (2014).
[Crossref] [PubMed]

H. S. Lui, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, and A. D. Rakic, “Terahertz inverse synthetic aperture radar imaging using self-mixing interferometry with a quantum cascade laser,” Opt. Lett. 39, 2629–2632 (2014).
[Crossref] [PubMed]

A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, Z. Ikonic, P. Harrison, A. Valavanis, S. P. Khanna, M. Lachab, S. J. Wilson, E. H. Linfield, and A. G. Davies, “Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis,” Opt. Express 21, 22194–22205 (2013).
[Crossref] [PubMed]

P. Dean, Y. L. Lim, A. Valavanis, S. P. Khanna, M. Lachab, R. Kliese, M. Nikolic, Z. Ikonic, D. Indjin, P. Harrison, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging through self-mixing in a quantum cascade laser,” Opt. Lett. 36, 2587–2589 (2011).
[Crossref] [PubMed]

Y. L. Lim, P. Dean, M. Nikolic, R. Kliese, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, Z. Ikonic, P. Harrison, E. H. Linfield, A. G. Davies, S. J. Wilson, and A. D. Rakic, “Demonstration of a self-mixing displacement sensor based on THz quantum cascade lasers,” Appl. Phys. Lett. 99, 081108 (2011).
[Crossref]

Leclerc, M.

L. Marchese, M. Doucet, N. Blanchard, M. Leclerc, M. Terroux, M. Briand, M. Otis, M. Jacob, C. Akitegetse, H. Spisser, L. Mercier, F. Duchesne, M. Girard, L. Gagnon, M. Massicote, B. Fisette, M. Tremblay, B. Tremblay, P. Bourqui, and A. Bergeron, “Overcoming the challenges of active THz/MM-wave imaging: an optics perspective,” Proc. SPIE 10639, 106392B (2018).

Lee, A. W.

Lee, A. W. M.

S. Kumar and A. W. M. Lee, “Resonant-phonon terahertz quantum-cascade lasers and video-rate terahertz imaging,” IEEE J. Sel. Top. Quantum Electron. 14, 333–344 (2008).
[Crossref]

A. W. M. Lee, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Real-time imaging using a 4.3-THz quantum cascade laser and a 320 × 240 microbolometer focal-plane array,” IEEE Photon. Technol. Lett. 18, 1415–1417 (2006).
[Crossref]

Lemus-Bedolla, E.

G. Hernandez-Cardoso, S. Rojas-Landeros, M. Alfaro-Gomez, A. Hernandez-Serrano, I. Salas-Gutierrez, E. Lemus-Bedolla, A. Castillo-Guzman, H. Lopez-Lemus, and E. Castro-Camus, “Terahertz imaging for early screening of diabetic foot syndrome: A proof of concept,” Sci. Rep. 7, 42124 (2017).
[Crossref] [PubMed]

Li, L.

I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
[Crossref]

P. Dean, O. Mitrofanov, J. Keeley, I. Kundu, L. Li, E. H. Linfield, and A. G. Davies, “Apertureless near-field terahertz imaging using the self-mixing effect in a quantum cascade laser,” Appl. Phys. Lett. 108, 091113 (2016).
[Crossref]

L. Li, L. Chen, J. Zhu, J. Freeman, P. Dean, A. Valavanis, A. G. Davies, and E. H. Linfield, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50, 309–311 (2014).
[Crossref]

P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. Lim, R. Alhathlool, A. Burnett, L. Li, S. Khanna, D. Indjin, T. Taimre, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging using quantum cascade lasers – a review of systems and applications,” J. Phys. D: Appl. Phys. 47, 374008 (2014).
[Crossref]

Li, L. H.

L. H. Li, L. Chen, J. R. Freeman, M. Salih, P. Dean, A. G. Davies, and E. H. Linfield, “Multi-watt high-power THz frequency quantum cascade lasers,” Electron. Lett. 53, 799–800 (2017).
[Crossref]

A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
[Crossref]

A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
[Crossref] [PubMed]

J. Keeley, P. Dean, A. Valavanis, K. Bertling, Y. L. Lim, R. Alhathlool, T. Taimre, L. H. Li, D. Indjin, A. D. Rakić, E. H. Linfield, and A. G. Davies, “Three-dimensional terahertz imaging using swept-frequency feedback interferometry with a quantum cascade laser,” Opt. Lett. 40, 994–997 (2015).
[Crossref] [PubMed]

P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. L. Lim, R. Alhathlool, S. Chowdhury, T. Taimre, L. H. Li, D. Indjin, S. J. Wilson, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Coherent three-dimensional terahertz imaging through self-mixing in a quantum cascade laser,” Appl. Phys. Lett. 103, 181112 (2013).
[Crossref]

Li, M.

F. Qiu, Z. Tan, Z. Fu, W. Wan, M. Li, C. Wang, and J. Cao, “Reflective scanning imaging based on a fast terahertz photodetector,” Opt. Commun. 427, 170–174 (2018).
[Crossref]

Li, Q.

Li, Y.-D.

Lim, Y.

P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. Lim, R. Alhathlool, A. Burnett, L. Li, S. Khanna, D. Indjin, T. Taimre, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging using quantum cascade lasers – a review of systems and applications,” J. Phys. D: Appl. Phys. 47, 374008 (2014).
[Crossref]

Lim, Y. L.

K. Bertling, S. Han, T. Wu, C. Zhao, Y. L. Lim, P. Dean, S. P. Khanna, D. Indjin, E. H. Linfield, A. G. Davies, S. J. Wilson, T. Taimre, and A. D. Rakić, “Determining ethanol content of liquid solutions using laser feedback interferometry with a terahertz quantum cascade laser,” IEEE Sens. Lett. 2, 1–4 (2018).
[Crossref]

G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonić, P. Dean, A. Valavanis, D. Indjin, and A. D. Rakić, “Frequency tuning range control in pulsed terahertz quantum-cascade lasers: Applications in interferometry,” IEEE J. Quantum Electron. 54, 1–8 (2018).
[Crossref]

G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonic, P. Dean, A. Valavanis, P. Harrison, D. Indjin, and A. D. Rakic, “Temperature dependent high speed dynamics of terahertz quantum cascade lasers,” IEEE J. Sel. Top. Quantum Electron. 23, 1200209 (2017).
[Crossref]

X. Qi, G. Agnew, I. Kundu, T. Taimre, Y. L. Lim, K. Bertling, P. Dean, A. Grier, A. Valavanis, E. H. Linfield, A. G. Davies, D. Indjin, and A. D. Rakić, “Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer,” Opt. Express 25, 10153–10165 (2017).
[Crossref] [PubMed]

K. Bertling, T. Taimre, G. Agnew, Y. L. Lim, P. Dean, D. Indjin, S. Höfling, R. Weih, M. Kamp, M. von Edlinger, J. Koeth, and A. D. Rakić, “Simple electrical modulation scheme for laser feedback imaging,” IEEE J. Sensors 16, 1937–1942 (2016).
[Crossref]

A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
[Crossref] [PubMed]

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
[Crossref] [PubMed]

S. Han, K. Bertling, P. Dean, J. Keeley, A. D. Burnett, Y. L. Lim, S. P. Khanna, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, T. Taimre, and A. D. Rakic, “Laser feedback interferometry as a tool for analysis of compound mixtures at terahertz frequencies: towards imaging and identification of plastic explosives,” Sensors 16, 352 (2016).
[Crossref]

A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
[Crossref]

J. Keeley, P. Dean, A. Valavanis, K. Bertling, Y. L. Lim, R. Alhathlool, T. Taimre, L. H. Li, D. Indjin, A. D. Rakić, E. H. Linfield, and A. G. Davies, “Three-dimensional terahertz imaging using swept-frequency feedback interferometry with a quantum cascade laser,” Opt. Lett. 40, 994–997 (2015).
[Crossref] [PubMed]

T. Taimre, M. Nikolić, K. Bertling, Y. L. Lim, T. Bosch, and A. D. Rakić, “Laser feedback interferometry: a tutorial on the self-mixing effect for coherent sensing,” Adv. Opt. Photon. 7, 570–631 (2015).
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G. Agnew, A. Grier, T. Taimre, Y. L. Lim, M. Nikolić, A. Valavanis, J. Cooper, P. Dean, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, Z. Ikonić, D. Indjin, and A. D. Rakić, “Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations,” Appl. Phys. Lett. 106, 161105 (2015).
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Y. L. Lim, T. Taimre, K. Bertling, P. Dean, D. Indjin, S. P. Khanna, A. Valavanis, M. Lachab, H. Schaider, T. W. Prow, H. P. Soyer, E. H. Linfield, A. G. Davies, and A. D. Rakic, “High-contrast coherent terahertz imaging of porcine tissue via swept-frequency feedback interferometry,” Biomed. Opt. Express 5, 3981–3989 (2014).
[Crossref] [PubMed]

H. S. Lui, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, and A. D. Rakic, “Terahertz inverse synthetic aperture radar imaging using self-mixing interferometry with a quantum cascade laser,” Opt. Lett. 39, 2629–2632 (2014).
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T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, and A. D. Rakić, “Methodology for materials analysis using swept-frequency feedback interferometry with terahertz frequency quantum cascade lasers,” Opt. Express 22, 18633–18647 (2014).
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A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, S. J. Wilson, M. Nikolic, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, B. Ferguson, G. Walker, H. Schaider, and H. P. Soyer, “THz QCL self-mixing interferometry for biomedical applications,” Proc. SPIE 9199, 9199M (2014).

P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. L. Lim, R. Alhathlool, S. Chowdhury, T. Taimre, L. H. Li, D. Indjin, S. J. Wilson, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Coherent three-dimensional terahertz imaging through self-mixing in a quantum cascade laser,” Appl. Phys. Lett. 103, 181112 (2013).
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A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, Z. Ikonic, P. Harrison, A. Valavanis, S. P. Khanna, M. Lachab, S. J. Wilson, E. H. Linfield, and A. G. Davies, “Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis,” Opt. Express 21, 22194–22205 (2013).
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P. Dean, Y. L. Lim, A. Valavanis, S. P. Khanna, M. Lachab, R. Kliese, M. Nikolic, Z. Ikonic, D. Indjin, P. Harrison, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging through self-mixing in a quantum cascade laser,” Opt. Lett. 36, 2587–2589 (2011).
[Crossref] [PubMed]

Y. L. Lim, P. Dean, M. Nikolic, R. Kliese, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, Z. Ikonic, P. Harrison, E. H. Linfield, A. G. Davies, S. J. Wilson, and A. D. Rakic, “Demonstration of a self-mixing displacement sensor based on THz quantum cascade lasers,” Appl. Phys. Lett. 99, 081108 (2011).
[Crossref]

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I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
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K. Bertling, S. Han, T. Wu, C. Zhao, Y. L. Lim, P. Dean, S. P. Khanna, D. Indjin, E. H. Linfield, A. G. Davies, S. J. Wilson, T. Taimre, and A. D. Rakić, “Determining ethanol content of liquid solutions using laser feedback interferometry with a terahertz quantum cascade laser,” IEEE Sens. Lett. 2, 1–4 (2018).
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S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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X. Qi, G. Agnew, I. Kundu, T. Taimre, Y. L. Lim, K. Bertling, P. Dean, A. Grier, A. Valavanis, E. H. Linfield, A. G. Davies, D. Indjin, and A. D. Rakić, “Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer,” Opt. Express 25, 10153–10165 (2017).
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A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
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S. Han, K. Bertling, P. Dean, J. Keeley, A. D. Burnett, Y. L. Lim, S. P. Khanna, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, T. Taimre, and A. D. Rakic, “Laser feedback interferometry as a tool for analysis of compound mixtures at terahertz frequencies: towards imaging and identification of plastic explosives,” Sensors 16, 352 (2016).
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P. Dean, O. Mitrofanov, J. Keeley, I. Kundu, L. Li, E. H. Linfield, and A. G. Davies, “Apertureless near-field terahertz imaging using the self-mixing effect in a quantum cascade laser,” Appl. Phys. Lett. 108, 091113 (2016).
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G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
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A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
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J. Keeley, P. Dean, A. Valavanis, K. Bertling, Y. L. Lim, R. Alhathlool, T. Taimre, L. H. Li, D. Indjin, A. D. Rakić, E. H. Linfield, and A. G. Davies, “Three-dimensional terahertz imaging using swept-frequency feedback interferometry with a quantum cascade laser,” Opt. Lett. 40, 994–997 (2015).
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G. Agnew, A. Grier, T. Taimre, Y. L. Lim, M. Nikolić, A. Valavanis, J. Cooper, P. Dean, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, Z. Ikonić, D. Indjin, and A. D. Rakić, “Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations,” Appl. Phys. Lett. 106, 161105 (2015).
[Crossref]

Y. L. Lim, T. Taimre, K. Bertling, P. Dean, D. Indjin, S. P. Khanna, A. Valavanis, M. Lachab, H. Schaider, T. W. Prow, H. P. Soyer, E. H. Linfield, A. G. Davies, and A. D. Rakic, “High-contrast coherent terahertz imaging of porcine tissue via swept-frequency feedback interferometry,” Biomed. Opt. Express 5, 3981–3989 (2014).
[Crossref] [PubMed]

H. S. Lui, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, and A. D. Rakic, “Terahertz inverse synthetic aperture radar imaging using self-mixing interferometry with a quantum cascade laser,” Opt. Lett. 39, 2629–2632 (2014).
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P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. Lim, R. Alhathlool, A. Burnett, L. Li, S. Khanna, D. Indjin, T. Taimre, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging using quantum cascade lasers – a review of systems and applications,” J. Phys. D: Appl. Phys. 47, 374008 (2014).
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L. Li, L. Chen, J. Zhu, J. Freeman, P. Dean, A. Valavanis, A. G. Davies, and E. H. Linfield, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50, 309–311 (2014).
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P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. L. Lim, R. Alhathlool, S. Chowdhury, T. Taimre, L. H. Li, D. Indjin, S. J. Wilson, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Coherent three-dimensional terahertz imaging through self-mixing in a quantum cascade laser,” Appl. Phys. Lett. 103, 181112 (2013).
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A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, Z. Ikonic, P. Harrison, A. Valavanis, S. P. Khanna, M. Lachab, S. J. Wilson, E. H. Linfield, and A. G. Davies, “Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis,” Opt. Express 21, 22194–22205 (2013).
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P. Dean, Y. L. Lim, A. Valavanis, S. P. Khanna, M. Lachab, R. Kliese, M. Nikolic, Z. Ikonic, D. Indjin, P. Harrison, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging through self-mixing in a quantum cascade laser,” Opt. Lett. 36, 2587–2589 (2011).
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Y. L. Lim, P. Dean, M. Nikolic, R. Kliese, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, Z. Ikonic, P. Harrison, E. H. Linfield, A. G. Davies, S. J. Wilson, and A. D. Rakic, “Demonstration of a self-mixing displacement sensor based on THz quantum cascade lasers,” Appl. Phys. Lett. 99, 081108 (2011).
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I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
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S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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F. Mezzapesa, M. Petruzzella, M. Dabbicco, H. Beere, D. Ritchie, M. Vitiello, and G. Scamarcio, “Continuous-wave reflection imaging using optical feedback interferometry in terahertz and mid-infrared quantum cascade lasers,” IEEE Trans. Terahertz Sci. Tech. 4, 631–633 (2014).
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P. Dean, Y. L. Lim, A. Valavanis, S. P. Khanna, M. Lachab, R. Kliese, M. Nikolic, Z. Ikonic, D. Indjin, P. Harrison, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging through self-mixing in a quantum cascade laser,” Opt. Lett. 36, 2587–2589 (2011).
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Paoloni, C.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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Pardo, D.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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M. Stecher, C. Jördens, N. Krumbholz, C. Jansen, M. Scheller, R. Wilk, O. Peters, B. Scherger, B. Ewers, and M. Koch, “Towards industrial inspection with THz systems,” in Ultrashort Pulse Laser Technology (Springer, 2016), pp. 311–335.
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F. Mezzapesa, M. Petruzzella, M. Dabbicco, H. Beere, D. Ritchie, M. Vitiello, and G. Scamarcio, “Continuous-wave reflection imaging using optical feedback interferometry in terahertz and mid-infrared quantum cascade lasers,” IEEE Trans. Terahertz Sci. Tech. 4, 631–633 (2014).
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Prow, T. W.

Pye, R. J.

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Qi, X.

I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
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X. Qi, G. Agnew, I. Kundu, T. Taimre, Y. L. Lim, K. Bertling, P. Dean, A. Grier, A. Valavanis, E. H. Linfield, A. G. Davies, D. Indjin, and A. D. Rakić, “Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer,” Opt. Express 25, 10153–10165 (2017).
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A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
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F. Qiu, Z. Tan, Z. Fu, W. Wan, M. Li, C. Wang, and J. Cao, “Reflective scanning imaging based on a fast terahertz photodetector,” Opt. Commun. 427, 170–174 (2018).
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I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
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G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonić, P. Dean, A. Valavanis, D. Indjin, and A. D. Rakić, “Frequency tuning range control in pulsed terahertz quantum-cascade lasers: Applications in interferometry,” IEEE J. Quantum Electron. 54, 1–8 (2018).
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K. Bertling, S. Han, T. Wu, C. Zhao, Y. L. Lim, P. Dean, S. P. Khanna, D. Indjin, E. H. Linfield, A. G. Davies, S. J. Wilson, T. Taimre, and A. D. Rakić, “Determining ethanol content of liquid solutions using laser feedback interferometry with a terahertz quantum cascade laser,” IEEE Sens. Lett. 2, 1–4 (2018).
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G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonic, P. Dean, A. Valavanis, P. Harrison, D. Indjin, and A. D. Rakic, “Temperature dependent high speed dynamics of terahertz quantum cascade lasers,” IEEE J. Sel. Top. Quantum Electron. 23, 1200209 (2017).
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X. Qi, G. Agnew, I. Kundu, T. Taimre, Y. L. Lim, K. Bertling, P. Dean, A. Grier, A. Valavanis, E. H. Linfield, A. G. Davies, D. Indjin, and A. D. Rakić, “Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer,” Opt. Express 25, 10153–10165 (2017).
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K. Bertling, T. Taimre, G. Agnew, Y. L. Lim, P. Dean, D. Indjin, S. Höfling, R. Weih, M. Kamp, M. von Edlinger, J. Koeth, and A. D. Rakić, “Simple electrical modulation scheme for laser feedback imaging,” IEEE J. Sensors 16, 1937–1942 (2016).
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A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
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S. Han, K. Bertling, P. Dean, J. Keeley, A. D. Burnett, Y. L. Lim, S. P. Khanna, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, T. Taimre, and A. D. Rakic, “Laser feedback interferometry as a tool for analysis of compound mixtures at terahertz frequencies: towards imaging and identification of plastic explosives,” Sensors 16, 352 (2016).
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A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
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T. Taimre, M. Nikolić, K. Bertling, Y. L. Lim, T. Bosch, and A. D. Rakić, “Laser feedback interferometry: a tutorial on the self-mixing effect for coherent sensing,” Adv. Opt. Photon. 7, 570–631 (2015).
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J. Keeley, P. Dean, A. Valavanis, K. Bertling, Y. L. Lim, R. Alhathlool, T. Taimre, L. H. Li, D. Indjin, A. D. Rakić, E. H. Linfield, and A. G. Davies, “Three-dimensional terahertz imaging using swept-frequency feedback interferometry with a quantum cascade laser,” Opt. Lett. 40, 994–997 (2015).
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Y. L. Lim, T. Taimre, K. Bertling, P. Dean, D. Indjin, S. P. Khanna, A. Valavanis, M. Lachab, H. Schaider, T. W. Prow, H. P. Soyer, E. H. Linfield, A. G. Davies, and A. D. Rakic, “High-contrast coherent terahertz imaging of porcine tissue via swept-frequency feedback interferometry,” Biomed. Opt. Express 5, 3981–3989 (2014).
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H. S. Lui, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, and A. D. Rakic, “Terahertz inverse synthetic aperture radar imaging using self-mixing interferometry with a quantum cascade laser,” Opt. Lett. 39, 2629–2632 (2014).
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P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. Lim, R. Alhathlool, A. Burnett, L. Li, S. Khanna, D. Indjin, T. Taimre, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging using quantum cascade lasers – a review of systems and applications,” J. Phys. D: Appl. Phys. 47, 374008 (2014).
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P. Dean, Y. L. Lim, A. Valavanis, S. P. Khanna, M. Lachab, R. Kliese, M. Nikolic, Z. Ikonic, D. Indjin, P. Harrison, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging through self-mixing in a quantum cascade laser,” Opt. Lett. 36, 2587–2589 (2011).
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Ravaro, M.

M. Locatelli, M. Ravaro, S. Bartalini, L. Consolino, M. S. Vitiello, R. Cicchi, F. Pavone, and P. De Natale, “Real-time terahertz digital holography with a quantum cascade laser,” Sci. Rep. 5, 13566 (2015).
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S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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Ridler, N.

S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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Ritchie, D.

F. Mezzapesa, M. Petruzzella, M. Dabbicco, H. Beere, D. Ritchie, M. Vitiello, and G. Scamarcio, “Continuous-wave reflection imaging using optical feedback interferometry in terahertz and mid-infrared quantum cascade lasers,” IEEE Trans. Terahertz Sci. Tech. 4, 631–633 (2014).
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Y. Ren, R. Wallis, D. S. Jessop, R. Degl’Innocenti, A. Klimont, H. E. Beere, and D. A. Ritchie, “Fast terahertz imaging using a quantum cascade amplifier,” Appl. Phys. Lett. 107, 011107 (2015).
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Rizza, C.

F. P. Mezzapesa, L. L. Columbo, C. Rizza, M. Brambilla, A. Ciattoni, M. Dabbicco, M. S. Vitiello, and G. Scamarcio, “Photo-generated metamaterials induce modulation of CW terahertz quantum cascade lasers,” Sci. Rep. 5, 16207 (2015).
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A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, S. J. Wilson, M. Nikolic, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, B. Ferguson, G. Walker, H. Schaider, and H. P. Soyer, “THz QCL self-mixing interferometry for biomedical applications,” Proc. SPIE 9199, 9199M (2014).

Y. L. Lim, T. Taimre, K. Bertling, P. Dean, D. Indjin, S. P. Khanna, A. Valavanis, M. Lachab, H. Schaider, T. W. Prow, H. P. Soyer, E. H. Linfield, A. G. Davies, and A. D. Rakic, “High-contrast coherent terahertz imaging of porcine tissue via swept-frequency feedback interferometry,” Biomed. Opt. Express 5, 3981–3989 (2014).
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Soyer, H. P.

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Y. L. Lim, T. Taimre, K. Bertling, P. Dean, D. Indjin, S. P. Khanna, A. Valavanis, M. Lachab, H. Schaider, T. W. Prow, H. P. Soyer, E. H. Linfield, A. G. Davies, and A. D. Rakic, “High-contrast coherent terahertz imaging of porcine tissue via swept-frequency feedback interferometry,” Biomed. Opt. Express 5, 3981–3989 (2014).
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Stecher, M.

M. Stecher, C. Jördens, N. Krumbholz, C. Jansen, M. Scheller, R. Wilk, O. Peters, B. Scherger, B. Ewers, and M. Koch, “Towards industrial inspection with THz systems,” in Ultrashort Pulse Laser Technology (Springer, 2016), pp. 311–335.
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G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonić, P. Dean, A. Valavanis, D. Indjin, and A. D. Rakić, “Frequency tuning range control in pulsed terahertz quantum-cascade lasers: Applications in interferometry,” IEEE J. Quantum Electron. 54, 1–8 (2018).
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X. Qi, G. Agnew, I. Kundu, T. Taimre, Y. L. Lim, K. Bertling, P. Dean, A. Grier, A. Valavanis, E. H. Linfield, A. G. Davies, D. Indjin, and A. D. Rakić, “Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer,” Opt. Express 25, 10153–10165 (2017).
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K. Bertling, T. Taimre, G. Agnew, Y. L. Lim, P. Dean, D. Indjin, S. Höfling, R. Weih, M. Kamp, M. von Edlinger, J. Koeth, and A. D. Rakić, “Simple electrical modulation scheme for laser feedback imaging,” IEEE J. Sensors 16, 1937–1942 (2016).
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G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
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A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
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S. Han, K. Bertling, P. Dean, J. Keeley, A. D. Burnett, Y. L. Lim, S. P. Khanna, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, T. Taimre, and A. D. Rakic, “Laser feedback interferometry as a tool for analysis of compound mixtures at terahertz frequencies: towards imaging and identification of plastic explosives,” Sensors 16, 352 (2016).
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A. D. Rakic, Y. L. Lim, T. Taimre, G. Agnew, X. Qi, K. Bertling, S. Han, S. J. Wilson, I. Kundu, A. Grier, Z. Ikonic, A. Valavanis, A. Demic, J. Keeley, L. H. Li, E. H. Linfield, A. G. Davies, P. Harrison, B. Ferguson, G. Walker, T. Prow, D. Indjin, and H. P. Soyer, “Optical feedback effects on terahertz quantum cascade lasers: modelling and applications,” Proc. SPIE 10030, 1003016 (2016).
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T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, and A. D. Rakić, “Methodology for materials analysis using swept-frequency feedback interferometry with terahertz frequency quantum cascade lasers,” Opt. Express 22, 18633–18647 (2014).
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H. S. Lui, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, and A. D. Rakic, “Terahertz inverse synthetic aperture radar imaging using self-mixing interferometry with a quantum cascade laser,” Opt. Lett. 39, 2629–2632 (2014).
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P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. Lim, R. Alhathlool, A. Burnett, L. Li, S. Khanna, D. Indjin, T. Taimre, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging using quantum cascade lasers – a review of systems and applications,” J. Phys. D: Appl. Phys. 47, 374008 (2014).
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Thomas, B.

K. B. Cooper, R. J. Dengler, N. Llombart, B. Thomas, G. Chattopadhyay, and P. H. Siegel, “THz imaging radar for standoff personnel screening,” IEEE Trans. THz Sci. Technol. 1, 169–182 (2011).
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Tignon, J.

I. Kundu, F. Wang, X. Qi, H. Nong, P. Dean, J. Freeman, A. Valavanis, G. Agnew, A. Grier, T. Taimre, L. Li, D. Indjin, J. Mangeney, J. Tignon, S. S. Dhillon, A. D. Rakic, J. E. Cunningham, E. H. Linfield, and A. G. Davies, “Ultrafast switch-on dynamics of frequency tuneable semiconductor lasers,” Nat. Commun. 9, 3076 (2018).
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L. Marchese, M. Doucet, N. Blanchard, M. Leclerc, M. Terroux, M. Briand, M. Otis, M. Jacob, C. Akitegetse, H. Spisser, L. Mercier, F. Duchesne, M. Girard, L. Gagnon, M. Massicote, B. Fisette, M. Tremblay, B. Tremblay, P. Bourqui, and A. Bergeron, “Overcoming the challenges of active THz/MM-wave imaging: an optics perspective,” Proc. SPIE 10639, 106392B (2018).

Tremblay, M.

L. Marchese, M. Doucet, N. Blanchard, M. Leclerc, M. Terroux, M. Briand, M. Otis, M. Jacob, C. Akitegetse, H. Spisser, L. Mercier, F. Duchesne, M. Girard, L. Gagnon, M. Massicote, B. Fisette, M. Tremblay, B. Tremblay, P. Bourqui, and A. Bergeron, “Overcoming the challenges of active THz/MM-wave imaging: an optics perspective,” Proc. SPIE 10639, 106392B (2018).

Tsurumachi, N.

M. Yamagiwa, T. Ogawa, T. Minamikawa, D. G. Abdelsalam, K. Okabe, N. Tsurumachi, Y. Mizutani, T. Iwata, H. Yamamoto, and T. Yasui, “Real-time amplitude and phase imaging of optically opaque objects by combining full-field off-axis terahertz digital holography with angular spectrum reconstruction,” J. Infrared Millim. Terahertz Waves 39, 561–572 (2018).
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[Crossref]

G. Agnew, A. Grier, T. Taimre, K. Bertling, Y. L. Lim, Z. Ikonic, P. Dean, A. Valavanis, P. Harrison, D. Indjin, and A. D. Rakic, “Temperature dependent high speed dynamics of terahertz quantum cascade lasers,” IEEE J. Sel. Top. Quantum Electron. 23, 1200209 (2017).
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X. Qi, G. Agnew, I. Kundu, T. Taimre, Y. L. Lim, K. Bertling, P. Dean, A. Grier, A. Valavanis, E. H. Linfield, A. G. Davies, D. Indjin, and A. D. Rakić, “Multi-spectral terahertz sensing: proposal for a coupled-cavity quantum cascade laser based optical feedback interferometer,” Opt. Express 25, 10153–10165 (2017).
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A. Grier, P. Dean, A. Valavanis, J. Keeley, I. Kundu, J. D. Cooper, G. Agnew, T. Taimre, Y. L. Lim, K. Bertling, A. D. Rakić, L. H. Li, P. Harrison, E. H. Linfield, Z. Ikonić, A. G. Davies, and D. Indjin, “Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers,” Opt. Express 24, 21948–21956 (2016).
[Crossref] [PubMed]

G. Agnew, A. Grier, T. Taimre, Y. L. Lim, K. Bertling, Z. Ikonić, A. Valavanis, P. Dean, J. Cooper, S. P. Khanna, M. Lachab, E. H. Linfield, A. G. Davies, P. Harrison, D. Indjin, and A. D. Rakić, “Model for a pulsed terahertz quantum cascade laser under optical feedback,” Opt. Express 24, 20554–20570 (2016).
[Crossref] [PubMed]

S. Han, K. Bertling, P. Dean, J. Keeley, A. D. Burnett, Y. L. Lim, S. P. Khanna, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, T. Taimre, and A. D. Rakic, “Laser feedback interferometry as a tool for analysis of compound mixtures at terahertz frequencies: towards imaging and identification of plastic explosives,” Sensors 16, 352 (2016).
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H. S. Lui, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, S. P. Khanna, M. Lachab, A. Valavanis, D. Indjin, E. H. Linfield, A. G. Davies, and A. D. Rakic, “Terahertz inverse synthetic aperture radar imaging using self-mixing interferometry with a quantum cascade laser,” Opt. Lett. 39, 2629–2632 (2014).
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L. Li, L. Chen, J. Zhu, J. Freeman, P. Dean, A. Valavanis, A. G. Davies, and E. H. Linfield, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50, 309–311 (2014).
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P. Dean, Y. L. Lim, A. Valavanis, S. P. Khanna, M. Lachab, R. Kliese, M. Nikolic, Z. Ikonic, D. Indjin, P. Harrison, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Terahertz imaging through self-mixing in a quantum cascade laser,” Opt. Lett. 36, 2587–2589 (2011).
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Valzania, L.

L. Valzania, P. Zolliker, and E. Hack, “Topography of hidden objects using THz digital holography with multi-beam interferences,” Opt. Express 25, 11038–11047 (2017).
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E. Hack, L. Valzania, G. Gäumann, M. Shalaby, C. P. Hauri, and P. Zolliker, “Comparison of thermal detector arrays for off-axis THz holography and real-time THz imaging,” Sensors 16, 221 (2016).
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S. S. Dhillon, M. S. Vitiello, E. H. Linfield, A. G. Davies, M. C. Hoffmann, J. Booske, C. Paoloni, M. Gensch, P. Weightman, G. P. Williams, E. Castro-Camus, D. R. S. Cumming, F. Simoens, I. Escorcia-Carranza, J. Grant, S. Lucyszyn, M. Kuwata-Gonokami, K. Konishi, M. Koch, C. A. Schmuttenmaer, T. L. Cocker, R. Huber, A. G. Markelz, Z. D. Taylor, V. P. Wallace, J. A. Zeitler, J. Sibik, T. M. Korter, B. Ellison, S. Rea, P. Goldsmith, K. B. Cooper, R. Appleby, D. Pardo, P. G. Huggard, V. Krozer, H. Shams, M. Fice, C. Renaud, A. Seeds, A. Stohr, M. Naftaly, N. Ridler, R. Clarke, J. E. Cunningham, and M. B. Johnston, “The 2017 terahertz science and technology roadmap,” J. Phys. D: Appl. Phys. 50, 043001 (2017).
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K. Bertling, S. Han, T. Wu, C. Zhao, Y. L. Lim, P. Dean, S. P. Khanna, D. Indjin, E. H. Linfield, A. G. Davies, S. J. Wilson, T. Taimre, and A. D. Rakić, “Determining ethanol content of liquid solutions using laser feedback interferometry with a terahertz quantum cascade laser,” IEEE Sens. Lett. 2, 1–4 (2018).
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P. Dean, A. Valavanis, J. Keeley, K. Bertling, Y. L. Lim, R. Alhathlool, S. Chowdhury, T. Taimre, L. H. Li, D. Indjin, S. J. Wilson, A. D. Rakic, E. H. Linfield, and A. G. Davies, “Coherent three-dimensional terahertz imaging through self-mixing in a quantum cascade laser,” Appl. Phys. Lett. 103, 181112 (2013).
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A. D. Rakic, T. Taimre, K. Bertling, Y. L. Lim, P. Dean, D. Indjin, Z. Ikonic, P. Harrison, A. Valavanis, S. P. Khanna, M. Lachab, S. J. Wilson, E. H. Linfield, and A. G. Davies, “Swept-frequency feedback interferometry using terahertz frequency QCLs: a method for imaging and materials analysis,” Opt. Express 21, 22194–22205 (2013).
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K. Bertling, S. Han, T. Wu, C. Zhao, Y. L. Lim, P. Dean, S. P. Khanna, D. Indjin, E. H. Linfield, A. G. Davies, S. J. Wilson, T. Taimre, and A. D. Rakić, “Determining ethanol content of liquid solutions using laser feedback interferometry with a terahertz quantum cascade laser,” IEEE Sens. Lett. 2, 1–4 (2018).
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L. Valzania, P. Zolliker, and E. Hack, “Topography of hidden objects using THz digital holography with multi-beam interferences,” Opt. Express 25, 11038–11047 (2017).
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Adv. Opt. Photon. (2)

Appl. Phys. Lett. (8)

M. Wienold, T. Hagelschuer, N. Rothbart, L. Schrottke, K. Biermann, H. Grahn, and H.-W. Hübers, “Real-time terahertz imaging through self-mixing in a quantum-cascade laser,” Appl. Phys. Lett. 109, 011102 (2016).
[Crossref]

Y. Ren, R. Wallis, D. S. Jessop, R. Degl’Innocenti, A. Klimont, H. E. Beere, and D. A. Ritchie, “Fast terahertz imaging using a quantum cascade amplifier,” Appl. Phys. Lett. 107, 011107 (2015).
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F. Mezzapesa, L. Columbo, M. Brambilla, M. Dabbicco, M. Vitiello, and G. Scamarcio, “Imaging of free carriers in semiconductors via optical feedback in terahertz quantum cascade lasers,” Appl. Phys. Lett. 104, 041112 (2014).
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M. Stecher, C. Jördens, N. Krumbholz, C. Jansen, M. Scheller, R. Wilk, O. Peters, B. Scherger, B. Ewers, and M. Koch, “Towards industrial inspection with THz systems,” in Ultrashort Pulse Laser Technology (Springer, 2016), pp. 311–335.
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Figures (5)

Fig. 1
Fig. 1 (a) Schematic diagram of the experimental setup. (b) Expanded view of the QCL cold finger module. (c) Photo of the THz QCL mounted on the cold finger of the Stirling cooler.
Fig. 2
Fig. 2 Flow diagram illustrating the signal conditioning performed by the custom built laser pulse driver (see text for detailed description).
Fig. 3
Fig. 3 The effect on the SM signal of varying the pulse duration over three orders of magnitude: ∼ 300, 20, and 1 μs at 10 % duty cycle for square (dashed lines) and ramped (solid lines) pulses [rows (a), (b), and (c) respectively]. Left panels: Voltage and current curves. Right panels: extracted SM voltage signals for square (blue line) and ramped (green line) pulses.
Fig. 4
Fig. 4 THz images of an Australian $1 Coin using ∼ 1 μs pulses at 10 % duty cycle with 100 μm scanning pitch. (a) Amplitude and (b) phase images from an array of SM signals.
Fig. 5
Fig. 5 Amplitude (top rows) and phase (bottom rows) THz images of the numerals ‘2018’ on an Australian $1 Coin. (a) 1×, 4×, 8×, and 16× averaging (10% duty cycle, ∼ 1 μs pulse width). (b) 10%, 20%, 30%, and 50% duty cycle with a ∼ 1 μs pulse width (4× averaging).

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