Abstract

The growth in terahertz frequency applications utilising the quantum cascade laser is hampered by a lack of targeted power delivery solutions over large distances (>100 mm). Here we demonstrate the efficient coupling of double-metal quantum cascade lasers into flexible polystyrene lined hollow metallic waveguides via the use of a hollow copper waveguide integrated into the laser mounting block. Our approach exhibits low divergence, Gaussian-like emission, which is robust to misalignment error, at distances > 550 mm, with a coupling efficiency from the hollow copper waveguide into the flexible waveguide > 90%. We also demonstrate the ability to nitrogen purge the flexible waveguide, increasing the power transmission by up to 20% at 2.85 THz, which paves the way for future fibre based terahertz sensing and spectroscopy applications.

© 2015 Optical Society of America

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Corrections

22 October 2015: A correction was made to the author listing.


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2015 (1)

2014 (4)

R. Degl’Innocenti, Y. D. Shah, D. S. Jessop, Y. Ren, O. Mitrofanov, H. E. Beere, and D. A. Ritchie, “Hollow metallic waveguides integrated with terahertz quantum cascade lasers,” Opt. Express 22(20), 24439–24449 (2014).
[Crossref] [PubMed]

A. Valavanis, J. Zhu, J. Freeman, L. Li, L. Chen, A. G. Davies, E. H. Linfield, and P. Dean, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50(4), 309–311 (2014).
[Crossref]

M. Rösch, G. Scalari, M. Beck, and J. Faist, “Octave-spanning semiconductor laser,” Nat. Photonics 9(1), 42–47 (2014).
[Crossref]

A. Brewer, J. R. Freeman, P. Cavalié, J. Maysonnave, J. Tignon, S. S. Dhillon, H. E. Beere, and D. A. Ritchie, “Coherent detection of metal-metal terahertz quantum cascade lasers with improved emission characteristics,” Appl. Phys. Lett. 104(8), 081107 (2014).
[Crossref]

2013 (2)

2011 (3)

M. S. Vitiello, J. H. Xu, M. Kumar, F. Beltram, A. Tredicucci, O. Mitrofanov, H. E. Beere, and D. A. Ritchie, “High efficiency coupling of Terahertz micro-ring quantum cascade lasers to the low-loss optical modes of hollow metallic waveguides,” Opt. Express 19(2), 1122–1130 (2011).
[Crossref] [PubMed]

M. S. Vitiello, J. Xu, F. Beltram, A. Tredicucci, O. Mitrofanov, J. A. Harrington, H. E. Beere, and D. A. Ritchie, “Guiding a terahertz quantum cascade laser into a flexible silver-coated waveguide,” Appl. Phys. Lett. 110(6), 063112 (2011).

O. Mitrofanov, R. James, F. A. Fernandez, T. K. Mavrogordatos, and J. A. Harrington, “Reducing transmission losses in hollow THz waveguides,” IEEE Trans. THz Sci. Tech. 1(1), 124–132 (2011).
[Crossref]

2010 (1)

2009 (3)

M. I. Amanti, M. Fischer, G. Scalari, M. Beck, and J. Faist, “Low-divergence single-mode terahertz quantum cascade laser,” Nat. Photonics 3(10), 586–590 (2009).
[Crossref]

M. I. Amanti, G. Scalari, R. Terazzi, M. Fischer, M. Beck, J. Faist, A. Rudra, P. Gallo, and E. Kapon, “Bound-to-continuum terahertz quantum cascade laser with a single-quantum-well phonon extraction/injection stage,” New J. Phys. 11(12), 125022 (2009).
[Crossref]

J. Lloyd-Hughes, G. Scalari, A. van Kolck, M. Fischer, M. Beck, and J. Faist, “Coupling terahertz radiation between sub-wavelength metal-metal waveguides and free space using monolithically integrated horn antennae,” Opt. Express 17(20), 18387–18393 (2009).
[Crossref] [PubMed]

2008 (3)

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[Crossref]

A. Hassani, A. Dupuis, and M. Skorobogatiy, “Low loss porous terahertz fibers containing multiple subwavelength holes,” Appl. Phys. Lett. 92(7), 071101 (2008).
[Crossref]

B. Bowden, J. A. Harrington, and O. Mitrofanov, “Low-loss modes in hollow metallic terahertz waveguides with dielectric coatings,” Appl. Phys. Lett. 93(18), 181104 (2008).
[Crossref]

2007 (4)

2004 (1)

S. Barbieri, J. Alton, H. E. Beere, J. Fowler, E. H. Linfield, and D. A. Ritchie, “2.9 THz quantum cascade lasers operating up to 70K in continuous wave,” Appl. Phys. Lett. 85(10), 1674 (2004).
[Crossref]

2003 (1)

B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno, “Terahertz quantum-cascade laser at λ≈100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett. 83(11), 2124 (2003).
[Crossref]

2002 (2)

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417(6885), 156–159 (2002).
[Crossref] [PubMed]

H. Han, H. Park, M. Cho, and J. Kim, “Terahertz pulse propagation in a plastic photonic crystal fiber,” Appl. Phys. Lett. 80(15), 2634–2636 (2002).
[Crossref]

1997 (1)

M. Saito and K. Kikuchi, “Infrared optical fiber sensors,” Opt. Rev. 4(5), 527–538 (1997).
[Crossref]

Akalin, T.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[Crossref]

Alton, J.

S. Barbieri, J. Alton, H. E. Beere, J. Fowler, E. H. Linfield, and D. A. Ritchie, “2.9 THz quantum cascade lasers operating up to 70K in continuous wave,” Appl. Phys. Lett. 85(10), 1674 (2004).
[Crossref]

Amanti, M. I.

M. I. Amanti, G. Scalari, R. Terazzi, M. Fischer, M. Beck, J. Faist, A. Rudra, P. Gallo, and E. Kapon, “Bound-to-continuum terahertz quantum cascade laser with a single-quantum-well phonon extraction/injection stage,” New J. Phys. 11(12), 125022 (2009).
[Crossref]

M. I. Amanti, M. Fischer, G. Scalari, M. Beck, and J. Faist, “Low-divergence single-mode terahertz quantum cascade laser,” Nat. Photonics 3(10), 586–590 (2009).
[Crossref]

M. I. Amanti, M. Fischer, C. Walther, G. Scalari, and J. Faist, “Horn antennas for terahertz quantum cascade lasers,” Electron. Lett. 43(10), 573–574 (2007).
[Crossref]

Andronico, A.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[Crossref]

Barbieri, S.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[Crossref]

S. Barbieri, J. Alton, H. E. Beere, J. Fowler, E. H. Linfield, and D. A. Ritchie, “2.9 THz quantum cascade lasers operating up to 70K in continuous wave,” Appl. Phys. Lett. 85(10), 1674 (2004).
[Crossref]

Beck, M.

M. Rösch, G. Scalari, M. Beck, and J. Faist, “Octave-spanning semiconductor laser,” Nat. Photonics 9(1), 42–47 (2014).
[Crossref]

M. I. Amanti, M. Fischer, G. Scalari, M. Beck, and J. Faist, “Low-divergence single-mode terahertz quantum cascade laser,” Nat. Photonics 3(10), 586–590 (2009).
[Crossref]

M. I. Amanti, G. Scalari, R. Terazzi, M. Fischer, M. Beck, J. Faist, A. Rudra, P. Gallo, and E. Kapon, “Bound-to-continuum terahertz quantum cascade laser with a single-quantum-well phonon extraction/injection stage,” New J. Phys. 11(12), 125022 (2009).
[Crossref]

J. Lloyd-Hughes, G. Scalari, A. van Kolck, M. Fischer, M. Beck, and J. Faist, “Coupling terahertz radiation between sub-wavelength metal-metal waveguides and free space using monolithically integrated horn antennae,” Opt. Express 17(20), 18387–18393 (2009).
[Crossref] [PubMed]

Beere, H. E.

F. Castellano, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, D. A. Ritchie, and M. S. Vitiello, “THz waveguide adapters for efficient radiation out-coupling from double metal THz QCLs,” Opt. Express 23(4), 5190–5200 (2015).
[Crossref] [PubMed]

R. Degl’Innocenti, Y. D. Shah, D. S. Jessop, Y. Ren, O. Mitrofanov, H. E. Beere, and D. A. Ritchie, “Hollow metallic waveguides integrated with terahertz quantum cascade lasers,” Opt. Express 22(20), 24439–24449 (2014).
[Crossref] [PubMed]

A. Brewer, J. R. Freeman, P. Cavalié, J. Maysonnave, J. Tignon, S. S. Dhillon, H. E. Beere, and D. A. Ritchie, “Coherent detection of metal-metal terahertz quantum cascade lasers with improved emission characteristics,” Appl. Phys. Lett. 104(8), 081107 (2014).
[Crossref]

M. S. Vitiello, J. Xu, F. Beltram, A. Tredicucci, O. Mitrofanov, J. A. Harrington, H. E. Beere, and D. A. Ritchie, “Guiding a terahertz quantum cascade laser into a flexible silver-coated waveguide,” Appl. Phys. Lett. 110(6), 063112 (2011).

M. S. Vitiello, J. H. Xu, M. Kumar, F. Beltram, A. Tredicucci, O. Mitrofanov, H. E. Beere, and D. A. Ritchie, “High efficiency coupling of Terahertz micro-ring quantum cascade lasers to the low-loss optical modes of hollow metallic waveguides,” Opt. Express 19(2), 1122–1130 (2011).
[Crossref] [PubMed]

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[Crossref]

S. Barbieri, J. Alton, H. E. Beere, J. Fowler, E. H. Linfield, and D. A. Ritchie, “2.9 THz quantum cascade lasers operating up to 70K in continuous wave,” Appl. Phys. Lett. 85(10), 1674 (2004).
[Crossref]

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417(6885), 156–159 (2002).
[Crossref] [PubMed]

Beltram, F.

M. S. Vitiello, J. Xu, F. Beltram, A. Tredicucci, O. Mitrofanov, J. A. Harrington, H. E. Beere, and D. A. Ritchie, “Guiding a terahertz quantum cascade laser into a flexible silver-coated waveguide,” Appl. Phys. Lett. 110(6), 063112 (2011).

M. S. Vitiello, J. H. Xu, M. Kumar, F. Beltram, A. Tredicucci, O. Mitrofanov, H. E. Beere, and D. A. Ritchie, “High efficiency coupling of Terahertz micro-ring quantum cascade lasers to the low-loss optical modes of hollow metallic waveguides,” Opt. Express 19(2), 1122–1130 (2011).
[Crossref] [PubMed]

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417(6885), 156–159 (2002).
[Crossref] [PubMed]

Bledt, C. M.

Bowden, B.

B. Bowden, J. A. Harrington, and O. Mitrofanov, “Low-loss modes in hollow metallic terahertz waveguides with dielectric coatings,” Appl. Phys. Lett. 93(18), 181104 (2008).
[Crossref]

B. Bowden, J. A. Harrington, and O. Mitrofanov, “Silver/polystyrene-coated hollow glass waveguides for the transmission of terahertz radiation,” Opt. Lett. 32(20), 2945–2947 (2007).
[Crossref] [PubMed]

Brewer, A.

A. Brewer, J. R. Freeman, P. Cavalié, J. Maysonnave, J. Tignon, S. S. Dhillon, H. E. Beere, and D. A. Ritchie, “Coherent detection of metal-metal terahertz quantum cascade lasers with improved emission characteristics,” Appl. Phys. Lett. 104(8), 081107 (2014).
[Crossref]

Callebaut, H.

B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno, “Terahertz quantum-cascade laser at λ≈100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett. 83(11), 2124 (2003).
[Crossref]

Castellano, F.

Cavalié, P.

A. Brewer, J. R. Freeman, P. Cavalié, J. Maysonnave, J. Tignon, S. S. Dhillon, H. E. Beere, and D. A. Ritchie, “Coherent detection of metal-metal terahertz quantum cascade lasers with improved emission characteristics,” Appl. Phys. Lett. 104(8), 081107 (2014).
[Crossref]

Chen, L.

A. Valavanis, J. Zhu, J. Freeman, L. Li, L. Chen, A. G. Davies, E. H. Linfield, and P. Dean, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50(4), 309–311 (2014).
[Crossref]

Cho, M.

H. Han, H. Park, M. Cho, and J. Kim, “Terahertz pulse propagation in a plastic photonic crystal fiber,” Appl. Phys. Lett. 80(15), 2634–2636 (2002).
[Crossref]

Davies, A. G.

F. Castellano, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, D. A. Ritchie, and M. S. Vitiello, “THz waveguide adapters for efficient radiation out-coupling from double metal THz QCLs,” Opt. Express 23(4), 5190–5200 (2015).
[Crossref] [PubMed]

A. Valavanis, J. Zhu, J. Freeman, L. Li, L. Chen, A. G. Davies, E. H. Linfield, and P. Dean, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50(4), 309–311 (2014).
[Crossref]

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417(6885), 156–159 (2002).
[Crossref] [PubMed]

Dean, P.

A. Valavanis, J. Zhu, J. Freeman, L. Li, L. Chen, A. G. Davies, E. H. Linfield, and P. Dean, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50(4), 309–311 (2014).
[Crossref]

Degl’Innocenti, R.

Dhillon, S. S.

A. Brewer, J. R. Freeman, P. Cavalié, J. Maysonnave, J. Tignon, S. S. Dhillon, H. E. Beere, and D. A. Ritchie, “Coherent detection of metal-metal terahertz quantum cascade lasers with improved emission characteristics,” Appl. Phys. Lett. 104(8), 081107 (2014).
[Crossref]

Dupuis, A.

A. Hassani, A. Dupuis, and M. Skorobogatiy, “Low loss porous terahertz fibers containing multiple subwavelength holes,” Appl. Phys. Lett. 92(7), 071101 (2008).
[Crossref]

Faist, J.

M. Rösch, G. Scalari, M. Beck, and J. Faist, “Octave-spanning semiconductor laser,” Nat. Photonics 9(1), 42–47 (2014).
[Crossref]

M. I. Amanti, M. Fischer, G. Scalari, M. Beck, and J. Faist, “Low-divergence single-mode terahertz quantum cascade laser,” Nat. Photonics 3(10), 586–590 (2009).
[Crossref]

J. Lloyd-Hughes, G. Scalari, A. van Kolck, M. Fischer, M. Beck, and J. Faist, “Coupling terahertz radiation between sub-wavelength metal-metal waveguides and free space using monolithically integrated horn antennae,” Opt. Express 17(20), 18387–18393 (2009).
[Crossref] [PubMed]

M. I. Amanti, G. Scalari, R. Terazzi, M. Fischer, M. Beck, J. Faist, A. Rudra, P. Gallo, and E. Kapon, “Bound-to-continuum terahertz quantum cascade laser with a single-quantum-well phonon extraction/injection stage,” New J. Phys. 11(12), 125022 (2009).
[Crossref]

M. I. Amanti, M. Fischer, C. Walther, G. Scalari, and J. Faist, “Horn antennas for terahertz quantum cascade lasers,” Electron. Lett. 43(10), 573–574 (2007).
[Crossref]

Fernandez, F. A.

O. Mitrofanov, R. James, F. A. Fernandez, T. K. Mavrogordatos, and J. A. Harrington, “Reducing transmission losses in hollow THz waveguides,” IEEE Trans. THz Sci. Tech. 1(1), 124–132 (2011).
[Crossref]

Filloux, P.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[Crossref]

Fischer, M.

M. I. Amanti, M. Fischer, G. Scalari, M. Beck, and J. Faist, “Low-divergence single-mode terahertz quantum cascade laser,” Nat. Photonics 3(10), 586–590 (2009).
[Crossref]

M. I. Amanti, G. Scalari, R. Terazzi, M. Fischer, M. Beck, J. Faist, A. Rudra, P. Gallo, and E. Kapon, “Bound-to-continuum terahertz quantum cascade laser with a single-quantum-well phonon extraction/injection stage,” New J. Phys. 11(12), 125022 (2009).
[Crossref]

J. Lloyd-Hughes, G. Scalari, A. van Kolck, M. Fischer, M. Beck, and J. Faist, “Coupling terahertz radiation between sub-wavelength metal-metal waveguides and free space using monolithically integrated horn antennae,” Opt. Express 17(20), 18387–18393 (2009).
[Crossref] [PubMed]

M. I. Amanti, M. Fischer, C. Walther, G. Scalari, and J. Faist, “Horn antennas for terahertz quantum cascade lasers,” Electron. Lett. 43(10), 573–574 (2007).
[Crossref]

Fowler, J.

S. Barbieri, J. Alton, H. E. Beere, J. Fowler, E. H. Linfield, and D. A. Ritchie, “2.9 THz quantum cascade lasers operating up to 70K in continuous wave,” Appl. Phys. Lett. 85(10), 1674 (2004).
[Crossref]

Freeman, J.

A. Valavanis, J. Zhu, J. Freeman, L. Li, L. Chen, A. G. Davies, E. H. Linfield, and P. Dean, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50(4), 309–311 (2014).
[Crossref]

Freeman, J. R.

A. Brewer, J. R. Freeman, P. Cavalié, J. Maysonnave, J. Tignon, S. S. Dhillon, H. E. Beere, and D. A. Ritchie, “Coherent detection of metal-metal terahertz quantum cascade lasers with improved emission characteristics,” Appl. Phys. Lett. 104(8), 081107 (2014).
[Crossref]

Gallo, P.

M. I. Amanti, G. Scalari, R. Terazzi, M. Fischer, M. Beck, J. Faist, A. Rudra, P. Gallo, and E. Kapon, “Bound-to-continuum terahertz quantum cascade laser with a single-quantum-well phonon extraction/injection stage,” New J. Phys. 11(12), 125022 (2009).
[Crossref]

Gellie, P.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[Crossref]

Han, H.

H. Han, H. Park, M. Cho, and J. Kim, “Terahertz pulse propagation in a plastic photonic crystal fiber,” Appl. Phys. Lett. 80(15), 2634–2636 (2002).
[Crossref]

Harrington, J. A.

M. Navarro-Cía, M. S. Vitiello, C. M. Bledt, J. E. Melzer, J. A. Harrington, and O. Mitrofanov, “Terahertz wave transmission in flexible polystyrene-lined hollow metallic waveguides for the 2.5-5 THz band,” Opt. Express 21(20), 23748–23755 (2013).
[Crossref] [PubMed]

C. M. Bledt, J. E. Melzer, and J. A. Harrington, “Fabrication and characterization of improved Ag/PS hollow-glass waveguides for THz transmission,” Appl. Opt. 52(27), 6703–6709 (2013).
[Crossref] [PubMed]

O. Mitrofanov, R. James, F. A. Fernandez, T. K. Mavrogordatos, and J. A. Harrington, “Reducing transmission losses in hollow THz waveguides,” IEEE Trans. THz Sci. Tech. 1(1), 124–132 (2011).
[Crossref]

M. S. Vitiello, J. Xu, F. Beltram, A. Tredicucci, O. Mitrofanov, J. A. Harrington, H. E. Beere, and D. A. Ritchie, “Guiding a terahertz quantum cascade laser into a flexible silver-coated waveguide,” Appl. Phys. Lett. 110(6), 063112 (2011).

O. Mitrofanov and J. A. Harrington, “Dielectric-lined cylindrical metallic THz waveguides: mode structure and dispersion,” Opt. Express 18(3), 1898–1903 (2010).
[Crossref] [PubMed]

B. Bowden, J. A. Harrington, and O. Mitrofanov, “Low-loss modes in hollow metallic terahertz waveguides with dielectric coatings,” Appl. Phys. Lett. 93(18), 181104 (2008).
[Crossref]

B. Bowden, J. A. Harrington, and O. Mitrofanov, “Silver/polystyrene-coated hollow glass waveguides for the transmission of terahertz radiation,” Opt. Lett. 32(20), 2945–2947 (2007).
[Crossref] [PubMed]

Hassani, A.

A. Hassani, A. Dupuis, and M. Skorobogatiy, “Low loss porous terahertz fibers containing multiple subwavelength holes,” Appl. Phys. Lett. 92(7), 071101 (2008).
[Crossref]

Hu, Q.

A. Wei Min Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides,” Opt. Lett. 32(19), 2840–2842 (2007).
[Crossref] [PubMed]

B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno, “Terahertz quantum-cascade laser at λ≈100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett. 83(11), 2124 (2003).
[Crossref]

Iotti, R. C.

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417(6885), 156–159 (2002).
[Crossref] [PubMed]

James, R.

O. Mitrofanov, R. James, F. A. Fernandez, T. K. Mavrogordatos, and J. A. Harrington, “Reducing transmission losses in hollow THz waveguides,” IEEE Trans. THz Sci. Tech. 1(1), 124–132 (2011).
[Crossref]

Jessop, D. S.

Kapon, E.

M. I. Amanti, G. Scalari, R. Terazzi, M. Fischer, M. Beck, J. Faist, A. Rudra, P. Gallo, and E. Kapon, “Bound-to-continuum terahertz quantum cascade laser with a single-quantum-well phonon extraction/injection stage,” New J. Phys. 11(12), 125022 (2009).
[Crossref]

Kikuchi, K.

M. Saito and K. Kikuchi, “Infrared optical fiber sensors,” Opt. Rev. 4(5), 527–538 (1997).
[Crossref]

Kim, J.

H. Han, H. Park, M. Cho, and J. Kim, “Terahertz pulse propagation in a plastic photonic crystal fiber,” Appl. Phys. Lett. 80(15), 2634–2636 (2002).
[Crossref]

Köhler, R.

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417(6885), 156–159 (2002).
[Crossref] [PubMed]

Kumar, M.

Kumar, S.

A. Wei Min Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides,” Opt. Lett. 32(19), 2840–2842 (2007).
[Crossref] [PubMed]

B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno, “Terahertz quantum-cascade laser at λ≈100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett. 83(11), 2124 (2003).
[Crossref]

Lampin, J.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[Crossref]

Leo, G.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[Crossref]

Li, L.

F. Castellano, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, D. A. Ritchie, and M. S. Vitiello, “THz waveguide adapters for efficient radiation out-coupling from double metal THz QCLs,” Opt. Express 23(4), 5190–5200 (2015).
[Crossref] [PubMed]

A. Valavanis, J. Zhu, J. Freeman, L. Li, L. Chen, A. G. Davies, E. H. Linfield, and P. Dean, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50(4), 309–311 (2014).
[Crossref]

Linfield, E. H.

F. Castellano, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, D. A. Ritchie, and M. S. Vitiello, “THz waveguide adapters for efficient radiation out-coupling from double metal THz QCLs,” Opt. Express 23(4), 5190–5200 (2015).
[Crossref] [PubMed]

A. Valavanis, J. Zhu, J. Freeman, L. Li, L. Chen, A. G. Davies, E. H. Linfield, and P. Dean, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50(4), 309–311 (2014).
[Crossref]

S. Barbieri, J. Alton, H. E. Beere, J. Fowler, E. H. Linfield, and D. A. Ritchie, “2.9 THz quantum cascade lasers operating up to 70K in continuous wave,” Appl. Phys. Lett. 85(10), 1674 (2004).
[Crossref]

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417(6885), 156–159 (2002).
[Crossref] [PubMed]

Lloyd-Hughes, J.

Maineult, W.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[Crossref]

Mavrogordatos, T. K.

O. Mitrofanov, R. James, F. A. Fernandez, T. K. Mavrogordatos, and J. A. Harrington, “Reducing transmission losses in hollow THz waveguides,” IEEE Trans. THz Sci. Tech. 1(1), 124–132 (2011).
[Crossref]

Maysonnave, J.

A. Brewer, J. R. Freeman, P. Cavalié, J. Maysonnave, J. Tignon, S. S. Dhillon, H. E. Beere, and D. A. Ritchie, “Coherent detection of metal-metal terahertz quantum cascade lasers with improved emission characteristics,” Appl. Phys. Lett. 104(8), 081107 (2014).
[Crossref]

Melzer, J. E.

Mitrofanov, O.

R. Degl’Innocenti, Y. D. Shah, D. S. Jessop, Y. Ren, O. Mitrofanov, H. E. Beere, and D. A. Ritchie, “Hollow metallic waveguides integrated with terahertz quantum cascade lasers,” Opt. Express 22(20), 24439–24449 (2014).
[Crossref] [PubMed]

M. Navarro-Cía, M. S. Vitiello, C. M. Bledt, J. E. Melzer, J. A. Harrington, and O. Mitrofanov, “Terahertz wave transmission in flexible polystyrene-lined hollow metallic waveguides for the 2.5-5 THz band,” Opt. Express 21(20), 23748–23755 (2013).
[Crossref] [PubMed]

M. S. Vitiello, J. H. Xu, M. Kumar, F. Beltram, A. Tredicucci, O. Mitrofanov, H. E. Beere, and D. A. Ritchie, “High efficiency coupling of Terahertz micro-ring quantum cascade lasers to the low-loss optical modes of hollow metallic waveguides,” Opt. Express 19(2), 1122–1130 (2011).
[Crossref] [PubMed]

M. S. Vitiello, J. Xu, F. Beltram, A. Tredicucci, O. Mitrofanov, J. A. Harrington, H. E. Beere, and D. A. Ritchie, “Guiding a terahertz quantum cascade laser into a flexible silver-coated waveguide,” Appl. Phys. Lett. 110(6), 063112 (2011).

O. Mitrofanov, R. James, F. A. Fernandez, T. K. Mavrogordatos, and J. A. Harrington, “Reducing transmission losses in hollow THz waveguides,” IEEE Trans. THz Sci. Tech. 1(1), 124–132 (2011).
[Crossref]

O. Mitrofanov and J. A. Harrington, “Dielectric-lined cylindrical metallic THz waveguides: mode structure and dispersion,” Opt. Express 18(3), 1898–1903 (2010).
[Crossref] [PubMed]

B. Bowden, J. A. Harrington, and O. Mitrofanov, “Low-loss modes in hollow metallic terahertz waveguides with dielectric coatings,” Appl. Phys. Lett. 93(18), 181104 (2008).
[Crossref]

B. Bowden, J. A. Harrington, and O. Mitrofanov, “Silver/polystyrene-coated hollow glass waveguides for the transmission of terahertz radiation,” Opt. Lett. 32(20), 2945–2947 (2007).
[Crossref] [PubMed]

Navarro-Cía, M.

Park, H.

H. Han, H. Park, M. Cho, and J. Kim, “Terahertz pulse propagation in a plastic photonic crystal fiber,” Appl. Phys. Lett. 80(15), 2634–2636 (2002).
[Crossref]

Peytavit, E.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[Crossref]

Qin, Q.

Ren, Y.

Reno, J. L.

A. Wei Min Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides,” Opt. Lett. 32(19), 2840–2842 (2007).
[Crossref] [PubMed]

B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno, “Terahertz quantum-cascade laser at λ≈100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett. 83(11), 2124 (2003).
[Crossref]

Ritchie, D. A.

F. Castellano, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, D. A. Ritchie, and M. S. Vitiello, “THz waveguide adapters for efficient radiation out-coupling from double metal THz QCLs,” Opt. Express 23(4), 5190–5200 (2015).
[Crossref] [PubMed]

R. Degl’Innocenti, Y. D. Shah, D. S. Jessop, Y. Ren, O. Mitrofanov, H. E. Beere, and D. A. Ritchie, “Hollow metallic waveguides integrated with terahertz quantum cascade lasers,” Opt. Express 22(20), 24439–24449 (2014).
[Crossref] [PubMed]

A. Brewer, J. R. Freeman, P. Cavalié, J. Maysonnave, J. Tignon, S. S. Dhillon, H. E. Beere, and D. A. Ritchie, “Coherent detection of metal-metal terahertz quantum cascade lasers with improved emission characteristics,” Appl. Phys. Lett. 104(8), 081107 (2014).
[Crossref]

M. S. Vitiello, J. Xu, F. Beltram, A. Tredicucci, O. Mitrofanov, J. A. Harrington, H. E. Beere, and D. A. Ritchie, “Guiding a terahertz quantum cascade laser into a flexible silver-coated waveguide,” Appl. Phys. Lett. 110(6), 063112 (2011).

M. S. Vitiello, J. H. Xu, M. Kumar, F. Beltram, A. Tredicucci, O. Mitrofanov, H. E. Beere, and D. A. Ritchie, “High efficiency coupling of Terahertz micro-ring quantum cascade lasers to the low-loss optical modes of hollow metallic waveguides,” Opt. Express 19(2), 1122–1130 (2011).
[Crossref] [PubMed]

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[Crossref]

S. Barbieri, J. Alton, H. E. Beere, J. Fowler, E. H. Linfield, and D. A. Ritchie, “2.9 THz quantum cascade lasers operating up to 70K in continuous wave,” Appl. Phys. Lett. 85(10), 1674 (2004).
[Crossref]

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417(6885), 156–159 (2002).
[Crossref] [PubMed]

Rösch, M.

M. Rösch, G. Scalari, M. Beck, and J. Faist, “Octave-spanning semiconductor laser,” Nat. Photonics 9(1), 42–47 (2014).
[Crossref]

Rossi, F.

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417(6885), 156–159 (2002).
[Crossref] [PubMed]

Rudra, A.

M. I. Amanti, G. Scalari, R. Terazzi, M. Fischer, M. Beck, J. Faist, A. Rudra, P. Gallo, and E. Kapon, “Bound-to-continuum terahertz quantum cascade laser with a single-quantum-well phonon extraction/injection stage,” New J. Phys. 11(12), 125022 (2009).
[Crossref]

Saito, M.

M. Saito and K. Kikuchi, “Infrared optical fiber sensors,” Opt. Rev. 4(5), 527–538 (1997).
[Crossref]

Scalari, G.

M. Rösch, G. Scalari, M. Beck, and J. Faist, “Octave-spanning semiconductor laser,” Nat. Photonics 9(1), 42–47 (2014).
[Crossref]

M. I. Amanti, M. Fischer, G. Scalari, M. Beck, and J. Faist, “Low-divergence single-mode terahertz quantum cascade laser,” Nat. Photonics 3(10), 586–590 (2009).
[Crossref]

M. I. Amanti, G. Scalari, R. Terazzi, M. Fischer, M. Beck, J. Faist, A. Rudra, P. Gallo, and E. Kapon, “Bound-to-continuum terahertz quantum cascade laser with a single-quantum-well phonon extraction/injection stage,” New J. Phys. 11(12), 125022 (2009).
[Crossref]

J. Lloyd-Hughes, G. Scalari, A. van Kolck, M. Fischer, M. Beck, and J. Faist, “Coupling terahertz radiation between sub-wavelength metal-metal waveguides and free space using monolithically integrated horn antennae,” Opt. Express 17(20), 18387–18393 (2009).
[Crossref] [PubMed]

M. I. Amanti, M. Fischer, C. Walther, G. Scalari, and J. Faist, “Horn antennas for terahertz quantum cascade lasers,” Electron. Lett. 43(10), 573–574 (2007).
[Crossref]

Shah, Y. D.

Sirtori, C.

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[Crossref]

Skorobogatiy, M.

A. Hassani, A. Dupuis, and M. Skorobogatiy, “Low loss porous terahertz fibers containing multiple subwavelength holes,” Appl. Phys. Lett. 92(7), 071101 (2008).
[Crossref]

Terazzi, R.

M. I. Amanti, G. Scalari, R. Terazzi, M. Fischer, M. Beck, J. Faist, A. Rudra, P. Gallo, and E. Kapon, “Bound-to-continuum terahertz quantum cascade laser with a single-quantum-well phonon extraction/injection stage,” New J. Phys. 11(12), 125022 (2009).
[Crossref]

Tignon, J.

A. Brewer, J. R. Freeman, P. Cavalié, J. Maysonnave, J. Tignon, S. S. Dhillon, H. E. Beere, and D. A. Ritchie, “Coherent detection of metal-metal terahertz quantum cascade lasers with improved emission characteristics,” Appl. Phys. Lett. 104(8), 081107 (2014).
[Crossref]

Tonouchi, M.

M. Tonouchi, “Cutting-edge terahertz technology,” Nat. Photonics 1(2), 97–105 (2007).
[Crossref]

Tredicucci, A.

M. S. Vitiello, J. Xu, F. Beltram, A. Tredicucci, O. Mitrofanov, J. A. Harrington, H. E. Beere, and D. A. Ritchie, “Guiding a terahertz quantum cascade laser into a flexible silver-coated waveguide,” Appl. Phys. Lett. 110(6), 063112 (2011).

M. S. Vitiello, J. H. Xu, M. Kumar, F. Beltram, A. Tredicucci, O. Mitrofanov, H. E. Beere, and D. A. Ritchie, “High efficiency coupling of Terahertz micro-ring quantum cascade lasers to the low-loss optical modes of hollow metallic waveguides,” Opt. Express 19(2), 1122–1130 (2011).
[Crossref] [PubMed]

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417(6885), 156–159 (2002).
[Crossref] [PubMed]

Valavanis, A.

A. Valavanis, J. Zhu, J. Freeman, L. Li, L. Chen, A. G. Davies, E. H. Linfield, and P. Dean, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50(4), 309–311 (2014).
[Crossref]

van Kolck, A.

Vitiello, M. S.

Walther, C.

M. I. Amanti, M. Fischer, C. Walther, G. Scalari, and J. Faist, “Horn antennas for terahertz quantum cascade lasers,” Electron. Lett. 43(10), 573–574 (2007).
[Crossref]

Wei Min Lee, A.

Williams, B. S.

A. Wei Min Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides,” Opt. Lett. 32(19), 2840–2842 (2007).
[Crossref] [PubMed]

B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno, “Terahertz quantum-cascade laser at λ≈100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett. 83(11), 2124 (2003).
[Crossref]

Xu, J.

M. S. Vitiello, J. Xu, F. Beltram, A. Tredicucci, O. Mitrofanov, J. A. Harrington, H. E. Beere, and D. A. Ritchie, “Guiding a terahertz quantum cascade laser into a flexible silver-coated waveguide,” Appl. Phys. Lett. 110(6), 063112 (2011).

Xu, J. H.

Zhu, J.

A. Valavanis, J. Zhu, J. Freeman, L. Li, L. Chen, A. G. Davies, E. H. Linfield, and P. Dean, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50(4), 309–311 (2014).
[Crossref]

Appl. Opt. (1)

Appl. Phys. Lett. (8)

S. Barbieri, J. Alton, H. E. Beere, J. Fowler, E. H. Linfield, and D. A. Ritchie, “2.9 THz quantum cascade lasers operating up to 70K in continuous wave,” Appl. Phys. Lett. 85(10), 1674 (2004).
[Crossref]

W. Maineult, P. Gellie, A. Andronico, P. Filloux, G. Leo, C. Sirtori, S. Barbieri, E. Peytavit, T. Akalin, J. Lampin, H. E. Beere, and D. A. Ritchie, “Metal-metal terahertz quantum cascade laser with micro-transverse-electromagnetic-horn antenna,” Appl. Phys. Lett. 93(18), 183508 (2008).
[Crossref]

H. Han, H. Park, M. Cho, and J. Kim, “Terahertz pulse propagation in a plastic photonic crystal fiber,” Appl. Phys. Lett. 80(15), 2634–2636 (2002).
[Crossref]

A. Hassani, A. Dupuis, and M. Skorobogatiy, “Low loss porous terahertz fibers containing multiple subwavelength holes,” Appl. Phys. Lett. 92(7), 071101 (2008).
[Crossref]

B. Bowden, J. A. Harrington, and O. Mitrofanov, “Low-loss modes in hollow metallic terahertz waveguides with dielectric coatings,” Appl. Phys. Lett. 93(18), 181104 (2008).
[Crossref]

B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno, “Terahertz quantum-cascade laser at λ≈100 μm using metal waveguide for mode confinement,” Appl. Phys. Lett. 83(11), 2124 (2003).
[Crossref]

M. S. Vitiello, J. Xu, F. Beltram, A. Tredicucci, O. Mitrofanov, J. A. Harrington, H. E. Beere, and D. A. Ritchie, “Guiding a terahertz quantum cascade laser into a flexible silver-coated waveguide,” Appl. Phys. Lett. 110(6), 063112 (2011).

A. Brewer, J. R. Freeman, P. Cavalié, J. Maysonnave, J. Tignon, S. S. Dhillon, H. E. Beere, and D. A. Ritchie, “Coherent detection of metal-metal terahertz quantum cascade lasers with improved emission characteristics,” Appl. Phys. Lett. 104(8), 081107 (2014).
[Crossref]

Electron. Lett. (2)

M. I. Amanti, M. Fischer, C. Walther, G. Scalari, and J. Faist, “Horn antennas for terahertz quantum cascade lasers,” Electron. Lett. 43(10), 573–574 (2007).
[Crossref]

A. Valavanis, J. Zhu, J. Freeman, L. Li, L. Chen, A. G. Davies, E. H. Linfield, and P. Dean, “Terahertz quantum cascade lasers with >1 W output powers,” Electron. Lett. 50(4), 309–311 (2014).
[Crossref]

IEEE Trans. THz Sci. Tech. (1)

O. Mitrofanov, R. James, F. A. Fernandez, T. K. Mavrogordatos, and J. A. Harrington, “Reducing transmission losses in hollow THz waveguides,” IEEE Trans. THz Sci. Tech. 1(1), 124–132 (2011).
[Crossref]

Nat. Photonics (3)

M. I. Amanti, M. Fischer, G. Scalari, M. Beck, and J. Faist, “Low-divergence single-mode terahertz quantum cascade laser,” Nat. Photonics 3(10), 586–590 (2009).
[Crossref]

M. Rösch, G. Scalari, M. Beck, and J. Faist, “Octave-spanning semiconductor laser,” Nat. Photonics 9(1), 42–47 (2014).
[Crossref]

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[Crossref]

Nature (1)

R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417(6885), 156–159 (2002).
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New J. Phys. (1)

M. I. Amanti, G. Scalari, R. Terazzi, M. Fischer, M. Beck, J. Faist, A. Rudra, P. Gallo, and E. Kapon, “Bound-to-continuum terahertz quantum cascade laser with a single-quantum-well phonon extraction/injection stage,” New J. Phys. 11(12), 125022 (2009).
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R. Degl’Innocenti, Y. D. Shah, D. S. Jessop, Y. Ren, O. Mitrofanov, H. E. Beere, and D. A. Ritchie, “Hollow metallic waveguides integrated with terahertz quantum cascade lasers,” Opt. Express 22(20), 24439–24449 (2014).
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O. Mitrofanov and J. A. Harrington, “Dielectric-lined cylindrical metallic THz waveguides: mode structure and dispersion,” Opt. Express 18(3), 1898–1903 (2010).
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M. S. Vitiello, J. H. Xu, M. Kumar, F. Beltram, A. Tredicucci, O. Mitrofanov, H. E. Beere, and D. A. Ritchie, “High efficiency coupling of Terahertz micro-ring quantum cascade lasers to the low-loss optical modes of hollow metallic waveguides,” Opt. Express 19(2), 1122–1130 (2011).
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Figures (7)

Fig. 1
Fig. 1

a) Schematic of the integrated MWG, showing the MM QCL indium bonded parallel with the central axis of a 6.8 mm long hollow cylindrical waveguide monolithically incorporated into the mounting block. b) Schematic cross-sectional view of the setup to couple the integrated MWG to the external PS-MWG. The lengths of the MWG and PS-MWG are 6.80 and 555 mm respectively, and the thickness of the HDPE window is 1.35 mm. c) Inset showing the ~2.0 mm separation between the MWG and PS-MWG.

Fig. 2
Fig. 2

Beam profiles of the integrated MWG device with hybrid BtC AR, acquired using a Golay cell with a 1 mm aperture, scanned in the plane perpendicular to the beam. Profiles are normalised to their individual peak powers. a) Beam profile acquired at a distance of 7 mm from the rear facet of the device b) Beam profile acquired at a distance of 7 mm from the end of the MWG c) Beam profile measured at 7 mm from the end of the PS-MWG, exhibiting the HE11 mode d) Beam profile of the integrated WG device with the laser deliberately misaligned by ~150 µm in both x and z directions, acquired at 7 mm from the end of the WG e) Beam profile measured at 7 mm from the end of the PS-MWG after excitation by misaligned device, still exhibiting the HE11 mode.

Fig. 3
Fig. 3

a) Schematic of the calculation of the mode overlap between the TE11 mode of the MWG, internal to the cryostat, and the HE11 mode of the external PS-MWG at a separation of 3 mm. b) Comparison of line cuts from the simulated TE11 mode in x and z directions at a distance of 3 mm from the exit of the MWG, and the symmetric HE11 mode at the entrance to the PS-MWG, showing a high degree of overlap (> 80%).

Fig. 4
Fig. 4

a) Normalised beam profile measured at 4.5 mm from the PS-MWG, showing excitation of the HE11 mode. b) Gaussian fit of the experimental beam profile in the vertical (z) direction. c) Gaussian fit of the experimental beam profile in the horizontal (x) direction. d) Gaussian fits of experimental beam profiles, taken in the x direction at 4.5, 7.0, 10.0 and 20.0 mm from the PS-MWG, showing a divergence half angle of ~7°. The dashed lines show the theoretical divergence calculated using Gaussian optics (~5°).

Fig. 5
Fig. 5

Comparison of beam profiles acquired at 7 mm from end of PS-MWG, upon excitation from the MWG (left) and silicon lens QCL (right), with an angular, bi-lobed higher order mode excited in the latter case. Each profile is normalised to its own peak value.

Fig. 6
Fig. 6

a) Effect of MWG misalignment on PS-MWG mode excitation, with misalignment of 0, 0.5 and 1.0 mm in the x direction respectively. Beam profiles were acquired at 4.5 mm from the PS-MWG end, and each normalised to their peak power values. The excitation of the HE11 mode is maintained in each case, and is also the case for displacement in the z direction. b) Normalised power transmission through PS-MWG for the three cases of excitation – bare MM QCL, MWG and Si lens, as a function of displacement of the exciting element in the x direction. c) Normalised power transmission as a function of displacement in the z direction. d) Normalised power transmission as a function of separation from PS-MWG (y displacement) e) Normalised power transmission as a function of PS-MWG rotation in x-y plane. In all cases, a similar or greater tolerance for misalignment is observed for the MWG.

Fig. 7
Fig. 7

a) Schematic of the setup used to purge the PS-MWG, showing the direction of N2 flow. The QCL was held at 4.5 K and pulsed at 100 kHz and 30% duty cycle b) Exemplar light-current-voltage graph of transmitted power through the PS-MWG, under excitation from the MWG, without N2 purge (blue) and with N2 purge (red), with bias voltage on the left-hand axis and transmitted power on the right-hand axis. An increase in power of ~20% is observed.

Equations (2)

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P ( x , y ) = P 0 ( w 0 w ( y ) ) 2 e ( 2 x 2 w 2 ( y ) )
θ λ π w 0

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