Abstract

A simple thickness measurement method based on the coherent homodyne CW THz system was demonstrated; it does not require precise control of the frequencies of the beat source, and only accurate scanning of the optical delay line is needed. Three beat frequencies are sufficient for measuring the thickness of a sample without considering the modulo 2π ambiguity. A novel compact 1.55 μm λ/4 phase-shifted dual-mode laser (DML) was developed as an optical beat source for the CW THz system. The thickness of a sample was accurately estimated from the measurements using the proposed method. Our results clearly show the possibility of a compact, simple, and cost-effective CW THz system for practical applications.

© 2012 OSA

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2012 (3)

M. Scheller, T. Kinder, O. Peters, T. Müller-Wirts, and M. Koch, “Single sampling point detection of frequency modulated terahertz waves,” J. Infra. Milli. Tera. Waves33(1), 36–42 (2012).
[CrossRef]

K. H. Park, N. Kim, H. Ko, H.-C. Ryu, J.-W. Park, S.-P. Han, and M. Y. Jeon, “Portable terahertz spectrometer with InP related semiconductor photonic devices,” Proc. SPIE8261, 826103, 826103-10 (2012).
[CrossRef]

S.-P. Han, N. Kim, H. Ko, H.-C. Ryu, J.-W. Park, Y.-J. Yoon, J.-H. Shin, D. H. Lee, S.-H. Park, S.-H. Moon, S.-W. Choi, H. S. Chun, and K. H. Park, “Compact fiber-pigtailed InGaAs photoconductive antenna module for terahertz-wave generation and detection,” Opt. Express20(16), 18432–18439 (2012).
[CrossRef] [PubMed]

2011 (2)

2010 (2)

A. Roggenbuck, H. Schmitz, A. Deninger, I. Cámara Mayorga, J. Hemberger, R. Güsten, and M. Grüninger, “Coherent broadband continuous-wave terahertz spectroscopy on solid-state samples,” New J. Phys.12(4), 043017 (2010).
[CrossRef]

M. Scheller, K. Baaske, and M. Koch, “Multifrequency continuous wave terahertz spectroscopy for absolute thickness determination,” Appl. Phys. Lett.96(15), 151112 (2010).
[CrossRef]

2009 (2)

2008 (1)

2007 (4)

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, K. Blary, and D. Lippens, “THz media characterization by means of coherent homodyne detection, results and potential applications,” Appl. Phys. B89(2-3), 395–399 (2007).
[CrossRef]

E. R. Brown, J. E. Bjarnason, A. M. Fedor, and T. M. Korter, “On the strong and narrow absorption signature in lactose at 0.53THz,” Appl. Phys. Lett.90(6), 061908 (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. IEEE95(8), 1514–1527 (2007).
[CrossRef]

M. Tonouchi, “Cutting-edge terahertz technology,” Nat. Photonics1(2), 97–105 (2007).
[CrossRef]

2006 (1)

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, and D. Lippens, “Anomalous dispersion measurement in terahertz frequency region by photomixing,” Appl. Phys. Lett.88(18), 181105 (2006).
[CrossRef]

2005 (2)

J. Renaudier, G.-H. Duan, J.-G. Provost, H. Debregeas-Sillard, and P. Gallion, “Phase correlation between longitudinal modes in semiconductor self-pulsating DBR lasers,” IEEE Photon. Technol. Lett.17(4), 741–743 (2005).
[CrossRef]

S. Gregory, C. Baker, W. R. Tribe, I. V. Bradley, M. J. Evans, E. H. Linfield, A. G. Davies, and M. Missous, “Optimization of photomixers and antennas for continuous-wave terahertz emission,” IEEE J. Quantum Electron.41(5), 717–728 (2005).
[CrossRef]

1998 (1)

S. Verghese, K. A. McIntosh, S. Calawa, W. F. Dinatale, E. K. Duerr, and K. A. Molvar, “Generation and detection of coherent terahertz waves using two photomixers,” Appl. Phys. Lett.73(26), 3824–3826 (1998).
[CrossRef]

1997 (1)

S. Verghese, K. A. McIntosh, and E. R. Brown, “Highly Tunable Fiber-Coupled Photomixers with Coherent Terahertz Output Power,” IEEE Trans. Microw. Theory Tech.45(8), 1301–1309 (1997).
[CrossRef]

Baaske, K.

M. Scheller, K. Baaske, and M. Koch, “Multifrequency continuous wave terahertz spectroscopy for absolute thickness determination,” Appl. Phys. Lett.96(15), 151112 (2010).
[CrossRef]

Bach, H.-G.

Baker, C.

S. Gregory, C. Baker, W. R. Tribe, I. V. Bradley, M. J. Evans, E. H. Linfield, A. G. Davies, and M. Missous, “Optimization of photomixers and antennas for continuous-wave terahertz emission,” IEEE J. Quantum Electron.41(5), 717–728 (2005).
[CrossRef]

Bigourd, D.

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, K. Blary, and D. Lippens, “THz media characterization by means of coherent homodyne detection, results and potential applications,” Appl. Phys. B89(2-3), 395–399 (2007).
[CrossRef]

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, and D. Lippens, “Anomalous dispersion measurement in terahertz frequency region by photomixing,” Appl. Phys. Lett.88(18), 181105 (2006).
[CrossRef]

Bjarnason, J. E.

E. R. Brown, J. E. Bjarnason, A. M. Fedor, and T. M. Korter, “On the strong and narrow absorption signature in lactose at 0.53THz,” Appl. Phys. Lett.90(6), 061908 (2007).
[CrossRef]

Blary, K.

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, K. Blary, and D. Lippens, “THz media characterization by means of coherent homodyne detection, results and potential applications,” Appl. Phys. B89(2-3), 395–399 (2007).
[CrossRef]

Bocquet, R.

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, K. Blary, and D. Lippens, “THz media characterization by means of coherent homodyne detection, results and potential applications,” Appl. Phys. B89(2-3), 395–399 (2007).
[CrossRef]

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, and D. Lippens, “Anomalous dispersion measurement in terahertz frequency region by photomixing,” Appl. Phys. Lett.88(18), 181105 (2006).
[CrossRef]

Bradley, I. V.

S. Gregory, C. Baker, W. R. Tribe, I. V. Bradley, M. J. Evans, E. H. Linfield, A. G. Davies, and M. Missous, “Optimization of photomixers and antennas for continuous-wave terahertz emission,” IEEE J. Quantum Electron.41(5), 717–728 (2005).
[CrossRef]

Breitfeld, F.

Brown, E. R.

E. R. Brown, J. E. Bjarnason, A. M. Fedor, and T. M. Korter, “On the strong and narrow absorption signature in lactose at 0.53THz,” Appl. Phys. Lett.90(6), 061908 (2007).
[CrossRef]

S. Verghese, K. A. McIntosh, and E. R. Brown, “Highly Tunable Fiber-Coupled Photomixers with Coherent Terahertz Output Power,” IEEE Trans. Microw. Theory Tech.45(8), 1301–1309 (1997).
[CrossRef]

Calawa, S.

S. Verghese, K. A. McIntosh, S. Calawa, W. F. Dinatale, E. K. Duerr, and K. A. Molvar, “Generation and detection of coherent terahertz waves using two photomixers,” Appl. Phys. Lett.73(26), 3824–3826 (1998).
[CrossRef]

Cámara Mayorga, I.

A. Roggenbuck, H. Schmitz, A. Deninger, I. Cámara Mayorga, J. Hemberger, R. Güsten, and M. Grüninger, “Coherent broadband continuous-wave terahertz spectroscopy on solid-state samples,” New J. Phys.12(4), 043017 (2010).
[CrossRef]

Chen, Y.

H. B. Liu, H. Zhong, N. Karpowicz, Y. Chen, and X. C. Zhang, “Terahertz spectroscopy and imaging for defense and security applications,” Proc. IEEE95(8), 1514–1527 (2007).
[CrossRef]

Choi, S.-W.

Chun, H. S.

Cooke, D. G.

P. U. Jepsen, D. G. Cooke, and M. Koch, “Terahertz spectroscopy and imaging – Modern techniques and applications,” Laser Photon. Rev.5(1), 124–166 (2011).
[CrossRef]

Cuisset, A.

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, K. Blary, and D. Lippens, “THz media characterization by means of coherent homodyne detection, results and potential applications,” Appl. Phys. B89(2-3), 395–399 (2007).
[CrossRef]

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, and D. Lippens, “Anomalous dispersion measurement in terahertz frequency region by photomixing,” Appl. Phys. Lett.88(18), 181105 (2006).
[CrossRef]

Davies, A. G.

S. Gregory, C. Baker, W. R. Tribe, I. V. Bradley, M. J. Evans, E. H. Linfield, A. G. Davies, and M. Missous, “Optimization of photomixers and antennas for continuous-wave terahertz emission,” IEEE J. Quantum Electron.41(5), 717–728 (2005).
[CrossRef]

Debregeas-Sillard, H.

J. Renaudier, G.-H. Duan, J.-G. Provost, H. Debregeas-Sillard, and P. Gallion, “Phase correlation between longitudinal modes in semiconductor self-pulsating DBR lasers,” IEEE Photon. Technol. Lett.17(4), 741–743 (2005).
[CrossRef]

Deninger, A.

A. Roggenbuck, H. Schmitz, A. Deninger, I. Cámara Mayorga, J. Hemberger, R. Güsten, and M. Grüninger, “Coherent broadband continuous-wave terahertz spectroscopy on solid-state samples,” New J. Phys.12(4), 043017 (2010).
[CrossRef]

Dinatale, W. F.

S. Verghese, K. A. McIntosh, S. Calawa, W. F. Dinatale, E. K. Duerr, and K. A. Molvar, “Generation and detection of coherent terahertz waves using two photomixers,” Appl. Phys. Lett.73(26), 3824–3826 (1998).
[CrossRef]

Duan, G.-H.

J. Renaudier, G.-H. Duan, J.-G. Provost, H. Debregeas-Sillard, and P. Gallion, “Phase correlation between longitudinal modes in semiconductor self-pulsating DBR lasers,” IEEE Photon. Technol. Lett.17(4), 741–743 (2005).
[CrossRef]

Duerr, E. K.

S. Verghese, K. A. McIntosh, S. Calawa, W. F. Dinatale, E. K. Duerr, and K. A. Molvar, “Generation and detection of coherent terahertz waves using two photomixers,” Appl. Phys. Lett.73(26), 3824–3826 (1998).
[CrossRef]

Evans, M. J.

S. Gregory, C. Baker, W. R. Tribe, I. V. Bradley, M. J. Evans, E. H. Linfield, A. G. Davies, and M. Missous, “Optimization of photomixers and antennas for continuous-wave terahertz emission,” IEEE J. Quantum Electron.41(5), 717–728 (2005).
[CrossRef]

Fedor, A. M.

E. R. Brown, J. E. Bjarnason, A. M. Fedor, and T. M. Korter, “On the strong and narrow absorption signature in lactose at 0.53THz,” Appl. Phys. Lett.90(6), 061908 (2007).
[CrossRef]

Gallion, P.

J. Renaudier, G.-H. Duan, J.-G. Provost, H. Debregeas-Sillard, and P. Gallion, “Phase correlation between longitudinal modes in semiconductor self-pulsating DBR lasers,” IEEE Photon. Technol. Lett.17(4), 741–743 (2005).
[CrossRef]

Gregory, S.

S. Gregory, C. Baker, W. R. Tribe, I. V. Bradley, M. J. Evans, E. H. Linfield, A. G. Davies, and M. Missous, “Optimization of photomixers and antennas for continuous-wave terahertz emission,” IEEE J. Quantum Electron.41(5), 717–728 (2005).
[CrossRef]

Grüninger, M.

A. Roggenbuck, H. Schmitz, A. Deninger, I. Cámara Mayorga, J. Hemberger, R. Güsten, and M. Grüninger, “Coherent broadband continuous-wave terahertz spectroscopy on solid-state samples,” New J. Phys.12(4), 043017 (2010).
[CrossRef]

Güsten, R.

A. Roggenbuck, H. Schmitz, A. Deninger, I. Cámara Mayorga, J. Hemberger, R. Güsten, and M. Grüninger, “Coherent broadband continuous-wave terahertz spectroscopy on solid-state samples,” New J. Phys.12(4), 043017 (2010).
[CrossRef]

Han, S.-P.

Hemberger, J.

A. Roggenbuck, H. Schmitz, A. Deninger, I. Cámara Mayorga, J. Hemberger, R. Güsten, and M. Grüninger, “Coherent broadband continuous-wave terahertz spectroscopy on solid-state samples,” New J. Phys.12(4), 043017 (2010).
[CrossRef]

Hindle, F.

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, K. Blary, and D. Lippens, “THz media characterization by means of coherent homodyne detection, results and potential applications,” Appl. Phys. B89(2-3), 395–399 (2007).
[CrossRef]

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, and D. Lippens, “Anomalous dispersion measurement in terahertz frequency region by photomixing,” Appl. Phys. Lett.88(18), 181105 (2006).
[CrossRef]

Jang, Y.

Jeon, M. Y.

Jepsen, P. U.

P. U. Jepsen, D. G. Cooke, and M. Koch, “Terahertz spectroscopy and imaging – Modern techniques and applications,” Laser Photon. Rev.5(1), 124–166 (2011).
[CrossRef]

Karpowicz, N.

H. B. Liu, H. Zhong, N. Karpowicz, Y. Chen, and X. C. Zhang, “Terahertz spectroscopy and imaging for defense and security applications,” Proc. IEEE95(8), 1514–1527 (2007).
[CrossRef]

Kim, N.

Kinder, T.

M. Scheller, T. Kinder, O. Peters, T. Müller-Wirts, and M. Koch, “Single sampling point detection of frequency modulated terahertz waves,” J. Infra. Milli. Tera. Waves33(1), 36–42 (2012).
[CrossRef]

Ko, H.

Koch, M.

M. Scheller, T. Kinder, O. Peters, T. Müller-Wirts, and M. Koch, “Single sampling point detection of frequency modulated terahertz waves,” J. Infra. Milli. Tera. Waves33(1), 36–42 (2012).
[CrossRef]

P. U. Jepsen, D. G. Cooke, and M. Koch, “Terahertz spectroscopy and imaging – Modern techniques and applications,” Laser Photon. Rev.5(1), 124–166 (2011).
[CrossRef]

M. Scheller, K. Baaske, and M. Koch, “Multifrequency continuous wave terahertz spectroscopy for absolute thickness determination,” Appl. Phys. Lett.96(15), 151112 (2010).
[CrossRef]

R. Wilk, F. Breitfeld, M. Mikulics, and M. Koch, “Continuous wave terahertz spectrometer as a noncontact thickness measuring device,” Appl. Opt.47(16), 3023–3026 (2008).
[CrossRef] [PubMed]

Korter, T. M.

E. R. Brown, J. E. Bjarnason, A. M. Fedor, and T. M. Korter, “On the strong and narrow absorption signature in lactose at 0.53THz,” Appl. Phys. Lett.90(6), 061908 (2007).
[CrossRef]

Kunkel, R.

Künzel, H.

Lampin, J. F.

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, K. Blary, and D. Lippens, “THz media characterization by means of coherent homodyne detection, results and potential applications,” Appl. Phys. B89(2-3), 395–399 (2007).
[CrossRef]

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, and D. Lippens, “Anomalous dispersion measurement in terahertz frequency region by photomixing,” Appl. Phys. Lett.88(18), 181105 (2006).
[CrossRef]

Lee, C. W.

Lee, D.

Lee, D. H.

Leem, Y. A.

Linfield, E. H.

S. Gregory, C. Baker, W. R. Tribe, I. V. Bradley, M. J. Evans, E. H. Linfield, A. G. Davies, and M. Missous, “Optimization of photomixers and antennas for continuous-wave terahertz emission,” IEEE J. Quantum Electron.41(5), 717–728 (2005).
[CrossRef]

Lippens, D.

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, K. Blary, and D. Lippens, “THz media characterization by means of coherent homodyne detection, results and potential applications,” Appl. Phys. B89(2-3), 395–399 (2007).
[CrossRef]

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, and D. Lippens, “Anomalous dispersion measurement in terahertz frequency region by photomixing,” Appl. Phys. Lett.88(18), 181105 (2006).
[CrossRef]

Liu, H. B.

H. B. Liu, H. Zhong, N. Karpowicz, Y. Chen, and X. C. Zhang, “Terahertz spectroscopy and imaging for defense and security applications,” Proc. IEEE95(8), 1514–1527 (2007).
[CrossRef]

Matton, S.

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, K. Blary, and D. Lippens, “THz media characterization by means of coherent homodyne detection, results and potential applications,” Appl. Phys. B89(2-3), 395–399 (2007).
[CrossRef]

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, and D. Lippens, “Anomalous dispersion measurement in terahertz frequency region by photomixing,” Appl. Phys. Lett.88(18), 181105 (2006).
[CrossRef]

McIntosh, K. A.

S. Verghese, K. A. McIntosh, S. Calawa, W. F. Dinatale, E. K. Duerr, and K. A. Molvar, “Generation and detection of coherent terahertz waves using two photomixers,” Appl. Phys. Lett.73(26), 3824–3826 (1998).
[CrossRef]

S. Verghese, K. A. McIntosh, and E. R. Brown, “Highly Tunable Fiber-Coupled Photomixers with Coherent Terahertz Output Power,” IEEE Trans. Microw. Theory Tech.45(8), 1301–1309 (1997).
[CrossRef]

Mikulics, M.

Missous, M.

S. Gregory, C. Baker, W. R. Tribe, I. V. Bradley, M. J. Evans, E. H. Linfield, A. G. Davies, and M. Missous, “Optimization of photomixers and antennas for continuous-wave terahertz emission,” IEEE J. Quantum Electron.41(5), 717–728 (2005).
[CrossRef]

Molvar, K. A.

S. Verghese, K. A. McIntosh, S. Calawa, W. F. Dinatale, E. K. Duerr, and K. A. Molvar, “Generation and detection of coherent terahertz waves using two photomixers,” Appl. Phys. Lett.73(26), 3824–3826 (1998).
[CrossRef]

Moon, S.-H.

Mouret, G.

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, K. Blary, and D. Lippens, “THz media characterization by means of coherent homodyne detection, results and potential applications,” Appl. Phys. B89(2-3), 395–399 (2007).
[CrossRef]

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, and D. Lippens, “Anomalous dispersion measurement in terahertz frequency region by photomixing,” Appl. Phys. Lett.88(18), 181105 (2006).
[CrossRef]

Müller-Wirts, T.

M. Scheller, T. Kinder, O. Peters, T. Müller-Wirts, and M. Koch, “Single sampling point detection of frequency modulated terahertz waves,” J. Infra. Milli. Tera. Waves33(1), 36–42 (2012).
[CrossRef]

Noh, S. K.

Park, J.-W.

Park, K. H.

Park, S.-H.

Peters, O.

M. Scheller, T. Kinder, O. Peters, T. Müller-Wirts, and M. Koch, “Single sampling point detection of frequency modulated terahertz waves,” J. Infra. Milli. Tera. Waves33(1), 36–42 (2012).
[CrossRef]

Provost, J.-G.

J. Renaudier, G.-H. Duan, J.-G. Provost, H. Debregeas-Sillard, and P. Gallion, “Phase correlation between longitudinal modes in semiconductor self-pulsating DBR lasers,” IEEE Photon. Technol. Lett.17(4), 741–743 (2005).
[CrossRef]

Renaudier, J.

J. Renaudier, G.-H. Duan, J.-G. Provost, H. Debregeas-Sillard, and P. Gallion, “Phase correlation between longitudinal modes in semiconductor self-pulsating DBR lasers,” IEEE Photon. Technol. Lett.17(4), 741–743 (2005).
[CrossRef]

Roehle, H.

Roggenbuck, A.

A. Roggenbuck, H. Schmitz, A. Deninger, I. Cámara Mayorga, J. Hemberger, R. Güsten, and M. Grüninger, “Coherent broadband continuous-wave terahertz spectroscopy on solid-state samples,” New J. Phys.12(4), 043017 (2010).
[CrossRef]

Ryu, H.-C.

Sartorius, B.

Schell, M.

Scheller, M.

M. Scheller, T. Kinder, O. Peters, T. Müller-Wirts, and M. Koch, “Single sampling point detection of frequency modulated terahertz waves,” J. Infra. Milli. Tera. Waves33(1), 36–42 (2012).
[CrossRef]

M. Scheller, K. Baaske, and M. Koch, “Multifrequency continuous wave terahertz spectroscopy for absolute thickness determination,” Appl. Phys. Lett.96(15), 151112 (2010).
[CrossRef]

Schlak, M.

Schmidt, D.

Schmitz, H.

A. Roggenbuck, H. Schmitz, A. Deninger, I. Cámara Mayorga, J. Hemberger, R. Güsten, and M. Grüninger, “Coherent broadband continuous-wave terahertz spectroscopy on solid-state samples,” New J. Phys.12(4), 043017 (2010).
[CrossRef]

Shin, J.

Shin, J.-H.

Sim, E.

Stanze, D.

Tonouchi, M.

M. Tonouchi, “Cutting-edge terahertz technology,” Nat. Photonics1(2), 97–105 (2007).
[CrossRef]

Tribe, W. R.

S. Gregory, C. Baker, W. R. Tribe, I. V. Bradley, M. J. Evans, E. H. Linfield, A. G. Davies, and M. Missous, “Optimization of photomixers and antennas for continuous-wave terahertz emission,” IEEE J. Quantum Electron.41(5), 717–728 (2005).
[CrossRef]

Verghese, S.

S. Verghese, K. A. McIntosh, S. Calawa, W. F. Dinatale, E. K. Duerr, and K. A. Molvar, “Generation and detection of coherent terahertz waves using two photomixers,” Appl. Phys. Lett.73(26), 3824–3826 (1998).
[CrossRef]

S. Verghese, K. A. McIntosh, and E. R. Brown, “Highly Tunable Fiber-Coupled Photomixers with Coherent Terahertz Output Power,” IEEE Trans. Microw. Theory Tech.45(8), 1301–1309 (1997).
[CrossRef]

Wilk, R.

Yee, D.-S.

Yoon, Y.-J.

Zhang, X. C.

H. B. Liu, H. Zhong, N. Karpowicz, Y. Chen, and X. C. Zhang, “Terahertz spectroscopy and imaging for defense and security applications,” Proc. IEEE95(8), 1514–1527 (2007).
[CrossRef]

Zhong, H.

H. B. Liu, H. Zhong, N. Karpowicz, Y. Chen, and X. C. Zhang, “Terahertz spectroscopy and imaging for defense and security applications,” Proc. IEEE95(8), 1514–1527 (2007).
[CrossRef]

Appl. Opt. (1)

Appl. Phys. B (1)

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, K. Blary, and D. Lippens, “THz media characterization by means of coherent homodyne detection, results and potential applications,” Appl. Phys. B89(2-3), 395–399 (2007).
[CrossRef]

Appl. Phys. Lett. (4)

E. R. Brown, J. E. Bjarnason, A. M. Fedor, and T. M. Korter, “On the strong and narrow absorption signature in lactose at 0.53THz,” Appl. Phys. Lett.90(6), 061908 (2007).
[CrossRef]

G. Mouret, S. Matton, R. Bocquet, D. Bigourd, F. Hindle, A. Cuisset, J. F. Lampin, and D. Lippens, “Anomalous dispersion measurement in terahertz frequency region by photomixing,” Appl. Phys. Lett.88(18), 181105 (2006).
[CrossRef]

M. Scheller, K. Baaske, and M. Koch, “Multifrequency continuous wave terahertz spectroscopy for absolute thickness determination,” Appl. Phys. Lett.96(15), 151112 (2010).
[CrossRef]

S. Verghese, K. A. McIntosh, S. Calawa, W. F. Dinatale, E. K. Duerr, and K. A. Molvar, “Generation and detection of coherent terahertz waves using two photomixers,” Appl. Phys. Lett.73(26), 3824–3826 (1998).
[CrossRef]

IEEE J. Quantum Electron. (1)

S. Gregory, C. Baker, W. R. Tribe, I. V. Bradley, M. J. Evans, E. H. Linfield, A. G. Davies, and M. Missous, “Optimization of photomixers and antennas for continuous-wave terahertz emission,” IEEE J. Quantum Electron.41(5), 717–728 (2005).
[CrossRef]

IEEE Photon. Technol. Lett. (1)

J. Renaudier, G.-H. Duan, J.-G. Provost, H. Debregeas-Sillard, and P. Gallion, “Phase correlation between longitudinal modes in semiconductor self-pulsating DBR lasers,” IEEE Photon. Technol. Lett.17(4), 741–743 (2005).
[CrossRef]

IEEE Trans. Microw. Theory Tech. (1)

S. Verghese, K. A. McIntosh, and E. R. Brown, “Highly Tunable Fiber-Coupled Photomixers with Coherent Terahertz Output Power,” IEEE Trans. Microw. Theory Tech.45(8), 1301–1309 (1997).
[CrossRef]

J. Infra. Milli. Tera. Waves (1)

M. Scheller, T. Kinder, O. Peters, T. Müller-Wirts, and M. Koch, “Single sampling point detection of frequency modulated terahertz waves,” J. Infra. Milli. Tera. Waves33(1), 36–42 (2012).
[CrossRef]

Laser Photon. Rev. (1)

P. U. Jepsen, D. G. Cooke, and M. Koch, “Terahertz spectroscopy and imaging – Modern techniques and applications,” Laser Photon. Rev.5(1), 124–166 (2011).
[CrossRef]

Nat. Photonics (1)

M. Tonouchi, “Cutting-edge terahertz technology,” Nat. Photonics1(2), 97–105 (2007).
[CrossRef]

New J. Phys. (1)

A. Roggenbuck, H. Schmitz, A. Deninger, I. Cámara Mayorga, J. Hemberger, R. Güsten, and M. Grüninger, “Coherent broadband continuous-wave terahertz spectroscopy on solid-state samples,” New J. Phys.12(4), 043017 (2010).
[CrossRef]

Opt. Express (4)

Proc. IEEE (1)

H. B. Liu, H. Zhong, N. Karpowicz, Y. Chen, and X. C. Zhang, “Terahertz spectroscopy and imaging for defense and security applications,” Proc. IEEE95(8), 1514–1527 (2007).
[CrossRef]

Proc. SPIE (1)

K. H. Park, N. Kim, H. Ko, H.-C. Ryu, J.-W. Park, S.-P. Han, and M. Y. Jeon, “Portable terahertz spectrometer with InP related semiconductor photonic devices,” Proc. SPIE8261, 826103, 826103-10 (2012).
[CrossRef]

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Figures (9)

Fig. 1
Fig. 1

Schematic diagram of the λ/4 phase-shifted dual mode laser.

Fig. 2
Fig. 2

Characteristics of the phase-shifted DML (a) mode tuning spectra, Inset shows the spectra showing the SMSR and FWM; (b) tuning speed of the λ/4 phase-shifted DML with the schematic diagram of the tuning speed measurement setup.

Fig. 3
Fig. 3

Schematic diagram of a coherent homodyne continuous-wave terahertz system setup.

Fig. 4
Fig. 4

THz signal of the homodyne coherent CW THz system based on the λ/4 phase-shifted DML.

Fig. 5
Fig. 5

Absorption coefficients of α-lactose pellet measured in (a) CW THz system and (b) PW THz system.

Fig. 6
Fig. 6

Normalized THz photocurrent measured (a) without and (b) with the PE pellet according to the variation in the optical delay in the frequency range from 448 GHz to 610 Hz in steps of about 4 GHz.

Fig. 7
Fig. 7

Summations of time traces measured at 37 frequencies without and with PE pellet.

Fig. 8
Fig. 8

Summations of the three time traces measured at three frequencies (a) without and (b) with PE sample for various frequency spans.

Fig. 9
Fig. 9

Summations of the time traces measured at 60 frequencies with five Teflon disks. Inset shows the optical delay position of the maximum peak according to the thickness of the Teflon disk.

Equations (3)

Equations on this page are rendered with MathJax. Learn more.

I THz E THz cos( 2πf c ΔL+φ ) whereΔL=( L Tx + L THz ) L Rx
0=( L Tx + L THz_ref ) L Rx_ref0 0=( L Tx + L THz_sam ) L Rx_sam0
L THz_sam = L THz_ref +(n1)d

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