Abstract

We present a continuous-wave terahertz (THz) vector spectroscopy and imaging system based on a 1.5-µm fiber optic uni-traveling-carrier photodiode and InGaAs photo-conductive receiver. Using electro-optic (EO) phase modulators for THz phase control with shortened optical paths, the system achieves fast vector measurement with effective phase stabilization. Dynamic ranges of 100 dB·Hz and 75 dB·Hz at 300 GHz and 1 THz, and phase stability of 1.5° per minute are obtained. With the simultaneous measurement of absorbance and relative permittivity, we demonstrate non-destructive analyses of pharmaceutical cocrystals inside tablets within a few minutes.

© 2014 Optical Society of America

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    [CrossRef]
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    [CrossRef]
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    [CrossRef]

2013 (5)

J.-Y. Kim, H.-J. Song, K. Ajito, M. Yaita, N. Kukutsu, “Continuous-Wave THz Homodyne Spectroscopy and Imaging System With Electro-Optical Phase Modulation for High Dynamic Range,” IEEE Trans. THz Sci. Tech. (Paris) 3, 158–164 (2013).

S. Hisatake, G. Kitahara, K. Ajito, Y. Fukada, N. Yoshimoto, T. Nagatsuma, “Phase-sensitive terahertz self-heterodyne system based on photodiode and low-temperature-grown GaAs photoconductor at 1.55 μm,” IEEE Sens. J. 13(1), 31–36 (2013).
[CrossRef]

M. Suga, Y. Sasaki, T. Sasahara, T. Yuasa, C. Otani, “THz phase-contrast computed tomography based on Mach-Zehnder interferometer using continuous wave source: proof of the concept,” Opt. Express 21(21), 25389–25402 (2013).
[CrossRef] [PubMed]

T. Göbel, D. Stanze, B. Globisch, R. J. B. Dietz, H. Roehle, M. Schell, “Telecom technology based continuous wave terahertz photomixing system with 105 decibel signal-to-noise ratio and 3.5 terahertz bandwidth,” Opt. Lett. 38(20), 4197–4199 (2013).
[CrossRef] [PubMed]

D. M. Charron, K. Ajito, J.-Y. Kim, Y. Ueno, “Chemical mapping of pharmaceutical cocrystals using terahertz spectroscopic imaging,” Anal. Chem. 85(4), 1980–1984 (2013).
[CrossRef] [PubMed]

2012 (1)

2011 (3)

K. Ajito, Y. Ueno, “THz Chemical Imaging for Biological Applications,” IEEE Trans. THz Sci. Tech. (Paris) 1, 293–300 (2011).

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

N. Kim, S.-P. Han, H. Ko, Y. A. Leem, H.-C. Ryu, C. W. Lee, D. Lee, M. Y. Jeon, S. K. Noh, K. H. Park, “Tunable continuous-wave terahertz generation/detection with compact 1.55 μm detuned dual-mode laser diode and InGaAs based photomixer,” Opt. Express 19(16), 15397–15403 (2011).
[CrossRef] [PubMed]

2010 (1)

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

2009 (1)

T. Göbel, D. Schoenherr, C. Sydlo, M. Feiginov, P. Meissner, H. L. Hartnagel, “Single-sampling-point coherent detection in continuous-wave photomixing terahertz systems,” Electron. Lett. 45(1), 65–66 (2009).
[CrossRef]

2008 (3)

2007 (1)

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

2006 (2)

Z. Yan, Y. Ying, H. Zhang, H. Yu, “Research progress of terahertz wave technology in food inspection,” Proc. SPIE 6373, 63730R (2006).
[CrossRef]

X. Xin, H. Altan, A. Saint, D. Matten, R. R. Alfano, “Terahertz absorption spectrum of para and ortho water vapors at different humidities at room temperature,” J. Appl. Phys. 100(9), 094905 (2006).
[CrossRef]

2005 (2)

H. Ito, T. Furuta, F. Nakajima, K. Yoshino, T. Ishibashi, “Photonic Generation of Continuous THz Wave Using Uni-Traveling-Carrier Photodiode,” J. Lightwave Technol. 23(12), 4016–4021 (2005).
[CrossRef]

I. S. Gregory, W. R. Tribe, C. Baker, B. E. Cole, M. J. Evans, L. Spencer, M. Pepper, M. Missous, “Continuous-wave terahertz system with a 60 dB dynamic range,” Appl. Phys. Lett. 86(20), 204104 (2005).
[CrossRef]

2003 (1)

Ajito, K.

J.-Y. Kim, H.-J. Song, K. Ajito, M. Yaita, N. Kukutsu, “Continuous-Wave THz Homodyne Spectroscopy and Imaging System With Electro-Optical Phase Modulation for High Dynamic Range,” IEEE Trans. THz Sci. Tech. (Paris) 3, 158–164 (2013).

S. Hisatake, G. Kitahara, K. Ajito, Y. Fukada, N. Yoshimoto, T. Nagatsuma, “Phase-sensitive terahertz self-heterodyne system based on photodiode and low-temperature-grown GaAs photoconductor at 1.55 μm,” IEEE Sens. J. 13(1), 31–36 (2013).
[CrossRef]

D. M. Charron, K. Ajito, J.-Y. Kim, Y. Ueno, “Chemical mapping of pharmaceutical cocrystals using terahertz spectroscopic imaging,” Anal. Chem. 85(4), 1980–1984 (2013).
[CrossRef] [PubMed]

K. Ajito, Y. Ueno, “THz Chemical Imaging for Biological Applications,” IEEE Trans. THz Sci. Tech. (Paris) 1, 293–300 (2011).

Alfano, R. R.

X. Xin, H. Altan, A. Saint, D. Matten, R. R. Alfano, “Terahertz absorption spectrum of para and ortho water vapors at different humidities at room temperature,” J. Appl. Phys. 100(9), 094905 (2006).
[CrossRef]

Altan, H.

X. Xin, H. Altan, A. Saint, D. Matten, R. R. Alfano, “Terahertz absorption spectrum of para and ortho water vapors at different humidities at room temperature,” J. Appl. Phys. 100(9), 094905 (2006).
[CrossRef]

Baker, C.

I. S. Gregory, W. R. Tribe, C. Baker, B. E. Cole, M. J. Evans, L. Spencer, M. Pepper, M. Missous, “Continuous-wave terahertz system with a 60 dB dynamic range,” Appl. Phys. Lett. 86(20), 204104 (2005).
[CrossRef]

Barat, R. B.

Bauer, M.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Bergeron, N. J.

J. R. Demers, R. T. Logan, N. J. Bergeron, E. R. Brown, “A coherent frequency-domain THz spectrometer with a signal-to-noise ratio 60 dB at 1 THz,” Proc. SPIE 6949, 694909 (2008).
[CrossRef]

Bolívar, P. H.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Boppel, S.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Breitfeld, F.

Brown, E. R.

J. R. Demers, R. T. Logan, N. J. Bergeron, E. R. Brown, “A coherent frequency-domain THz spectrometer with a signal-to-noise ratio 60 dB at 1 THz,” Proc. SPIE 6949, 694909 (2008).
[CrossRef]

Burghoff, D.

Charron, D. M.

D. M. Charron, K. Ajito, J.-Y. Kim, Y. Ueno, “Chemical mapping of pharmaceutical cocrystals using terahertz spectroscopic imaging,” Anal. Chem. 85(4), 1980–1984 (2013).
[CrossRef] [PubMed]

Cole, B. E.

I. S. Gregory, W. R. Tribe, C. Baker, B. E. Cole, M. J. Evans, L. Spencer, M. Pepper, M. Missous, “Continuous-wave terahertz system with a 60 dB dynamic range,” Appl. Phys. Lett. 86(20), 204104 (2005).
[CrossRef]

Demers, J. R.

J. R. Demers, R. T. Logan, N. J. Bergeron, E. R. Brown, “A coherent frequency-domain THz spectrometer with a signal-to-noise ratio 60 dB at 1 THz,” Proc. SPIE 6949, 694909 (2008).
[CrossRef]

Deninger, A.

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

Dietz, R. J. B.

Evans, M. J.

I. S. Gregory, W. R. Tribe, C. Baker, B. E. Cole, M. J. Evans, L. Spencer, M. Pepper, M. Missous, “Continuous-wave terahertz system with a 60 dB dynamic range,” Appl. Phys. Lett. 86(20), 204104 (2005).
[CrossRef]

Federici, J. F.

Feiginov, M.

T. Göbel, D. Schoenherr, C. Sydlo, M. Feiginov, P. Meissner, H. L. Hartnagel, “Single-sampling-point coherent detection in continuous-wave photomixing terahertz systems,” Electron. Lett. 45(1), 65–66 (2009).
[CrossRef]

Friederich, F.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Fukada, Y.

S. Hisatake, G. Kitahara, K. Ajito, Y. Fukada, N. Yoshimoto, T. Nagatsuma, “Phase-sensitive terahertz self-heterodyne system based on photodiode and low-temperature-grown GaAs photoconductor at 1.55 μm,” IEEE Sens. J. 13(1), 31–36 (2013).
[CrossRef]

Furuta, T.

Gary, D. E.

Globisch, B.

Göbel, T.

T. Göbel, D. Stanze, B. Globisch, R. J. B. Dietz, H. Roehle, M. Schell, “Telecom technology based continuous wave terahertz photomixing system with 105 decibel signal-to-noise ratio and 3.5 terahertz bandwidth,” Opt. Lett. 38(20), 4197–4199 (2013).
[CrossRef] [PubMed]

T. Göbel, D. Schoenherr, C. Sydlo, M. Feiginov, P. Meissner, H. L. Hartnagel, “Single-sampling-point coherent detection in continuous-wave photomixing terahertz systems,” Electron. Lett. 45(1), 65–66 (2009).
[CrossRef]

Gregory, I. S.

I. S. Gregory, W. R. Tribe, C. Baker, B. E. Cole, M. J. Evans, L. Spencer, M. Pepper, M. Missous, “Continuous-wave terahertz system with a 60 dB dynamic range,” Appl. Phys. Lett. 86(20), 204104 (2005).
[CrossRef]

Grüninger, M.

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

Han, S.-P.

Hartnagel, H. L.

T. Göbel, D. Schoenherr, C. Sydlo, M. Feiginov, P. Meissner, H. L. Hartnagel, “Single-sampling-point coherent detection in continuous-wave photomixing terahertz systems,” Electron. Lett. 45(1), 65–66 (2009).
[CrossRef]

Hemberger, J.

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

Henneberger, R.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Hils, B.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Hisatake, S.

S. Hisatake, G. Kitahara, K. Ajito, Y. Fukada, N. Yoshimoto, T. Nagatsuma, “Phase-sensitive terahertz self-heterodyne system based on photodiode and low-temperature-grown GaAs photoconductor at 1.55 μm,” IEEE Sens. J. 13(1), 31–36 (2013).
[CrossRef]

Hor, Y. L.

Hu, Q.

Huhn, A. K.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Inoue, H.

Ishibashi, T.

Ito, H.

Jeon, M. Y.

Kao, T.-Y.

Kawase, K.

Keil, A.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Kim, J.-Y.

D. M. Charron, K. Ajito, J.-Y. Kim, Y. Ueno, “Chemical mapping of pharmaceutical cocrystals using terahertz spectroscopic imaging,” Anal. Chem. 85(4), 1980–1984 (2013).
[CrossRef] [PubMed]

J.-Y. Kim, H.-J. Song, K. Ajito, M. Yaita, N. Kukutsu, “Continuous-Wave THz Homodyne Spectroscopy and Imaging System With Electro-Optical Phase Modulation for High Dynamic Range,” IEEE Trans. THz Sci. Tech. (Paris) 3, 158–164 (2013).

Kim, N.

Kitahara, G.

S. Hisatake, G. Kitahara, K. Ajito, Y. Fukada, N. Yoshimoto, T. Nagatsuma, “Phase-sensitive terahertz self-heterodyne system based on photodiode and low-temperature-grown GaAs photoconductor at 1.55 μm,” IEEE Sens. J. 13(1), 31–36 (2013).
[CrossRef]

Ko, H.

Koch, M.

Krozer, V.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Kukutsu, N.

J.-Y. Kim, H.-J. Song, K. Ajito, M. Yaita, N. Kukutsu, “Continuous-Wave THz Homodyne Spectroscopy and Imaging System With Electro-Optical Phase Modulation for High Dynamic Range,” IEEE Trans. THz Sci. Tech. (Paris) 3, 158–164 (2013).

Lee, A. W. M.

Lee, C. W.

Lee, D.

Leem, Y. A.

Lisauskas, A.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Liu, Z.

Löffler, T.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Logan, R. T.

J. R. Demers, R. T. Logan, N. J. Bergeron, E. R. Brown, “A coherent frequency-domain THz spectrometer with a signal-to-noise ratio 60 dB at 1 THz,” Proc. SPIE 6949, 694909 (2008).
[CrossRef]

Matten, D.

X. Xin, H. Altan, A. Saint, D. Matten, R. R. Alfano, “Terahertz absorption spectrum of para and ortho water vapors at different humidities at room temperature,” J. Appl. Phys. 100(9), 094905 (2006).
[CrossRef]

Mayorga, I. C.

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

Meissner, P.

T. Göbel, D. Schoenherr, C. Sydlo, M. Feiginov, P. Meissner, H. L. Hartnagel, “Single-sampling-point coherent detection in continuous-wave photomixing terahertz systems,” Electron. Lett. 45(1), 65–66 (2009).
[CrossRef]

Meng, F.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Michalopoulou, Z.-H.

Mikulics, M.

Missous, M.

I. S. Gregory, W. R. Tribe, C. Baker, B. E. Cole, M. J. Evans, L. Spencer, M. Pepper, M. Missous, “Continuous-wave terahertz system with a 60 dB dynamic range,” Appl. Phys. Lett. 86(20), 204104 (2005).
[CrossRef]

Nagatsuma, T.

S. Hisatake, G. Kitahara, K. Ajito, Y. Fukada, N. Yoshimoto, T. Nagatsuma, “Phase-sensitive terahertz self-heterodyne system based on photodiode and low-temperature-grown GaAs photoconductor at 1.55 μm,” IEEE Sens. J. 13(1), 31–36 (2013).
[CrossRef]

Nakajima, F.

Noh, S. K.

Ogawa, Y.

Otani, C.

Park, K. H.

Pepper, M.

I. S. Gregory, W. R. Tribe, C. Baker, B. E. Cole, M. J. Evans, L. Spencer, M. Pepper, M. Missous, “Continuous-wave terahertz system with a 60 dB dynamic range,” Appl. Phys. Lett. 86(20), 204104 (2005).
[CrossRef]

Reno, J. L.

Roehle, H.

Roggenbuck, A.

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

Roskos, H. G.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Ryu, H.-C.

Saint, A.

X. Xin, H. Altan, A. Saint, D. Matten, R. R. Alfano, “Terahertz absorption spectrum of para and ortho water vapors at different humidities at room temperature,” J. Appl. Phys. 100(9), 094905 (2006).
[CrossRef]

Sasahara, T.

Sasaki, Y.

Schell, M.

Schmitz, H.

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

Schoenherr, D.

T. Göbel, D. Schoenherr, C. Sydlo, M. Feiginov, P. Meissner, H. L. Hartnagel, “Single-sampling-point coherent detection in continuous-wave photomixing terahertz systems,” Electron. Lett. 45(1), 65–66 (2009).
[CrossRef]

Sinyukov, A. M.

Song, H.-J.

J.-Y. Kim, H.-J. Song, K. Ajito, M. Yaita, N. Kukutsu, “Continuous-Wave THz Homodyne Spectroscopy and Imaging System With Electro-Optical Phase Modulation for High Dynamic Range,” IEEE Trans. THz Sci. Tech. (Paris) 3, 158–164 (2013).

Spencer, L.

I. S. Gregory, W. R. Tribe, C. Baker, B. E. Cole, M. J. Evans, L. Spencer, M. Pepper, M. Missous, “Continuous-wave terahertz system with a 60 dB dynamic range,” Appl. Phys. Lett. 86(20), 204104 (2005).
[CrossRef]

Spickermann, G.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Spiegel, W. V.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Stanze, D.

Su, K.

Suga, M.

Sydlo, C.

T. Göbel, D. Schoenherr, C. Sydlo, M. Feiginov, P. Meissner, H. L. Hartnagel, “Single-sampling-point coherent detection in continuous-wave photomixing terahertz systems,” Electron. Lett. 45(1), 65–66 (2009).
[CrossRef]

Thomson, M. D.

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

Tonouchi, M.

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

Tribe, W. R.

I. S. Gregory, W. R. Tribe, C. Baker, B. E. Cole, M. J. Evans, L. Spencer, M. Pepper, M. Missous, “Continuous-wave terahertz system with a 60 dB dynamic range,” Appl. Phys. Lett. 86(20), 204104 (2005).
[CrossRef]

Ueno, Y.

D. M. Charron, K. Ajito, J.-Y. Kim, Y. Ueno, “Chemical mapping of pharmaceutical cocrystals using terahertz spectroscopic imaging,” Anal. Chem. 85(4), 1980–1984 (2013).
[CrossRef] [PubMed]

K. Ajito, Y. Ueno, “THz Chemical Imaging for Biological Applications,” IEEE Trans. THz Sci. Tech. (Paris) 1, 293–300 (2011).

Watanabe, Y.

Wilk, R.

Xin, X.

X. Xin, H. Altan, A. Saint, D. Matten, R. R. Alfano, “Terahertz absorption spectrum of para and ortho water vapors at different humidities at room temperature,” J. Appl. Phys. 100(9), 094905 (2006).
[CrossRef]

Yaita, M.

J.-Y. Kim, H.-J. Song, K. Ajito, M. Yaita, N. Kukutsu, “Continuous-Wave THz Homodyne Spectroscopy and Imaging System With Electro-Optical Phase Modulation for High Dynamic Range,” IEEE Trans. THz Sci. Tech. (Paris) 3, 158–164 (2013).

Yan, Z.

Z. Yan, Y. Ying, H. Zhang, H. Yu, “Research progress of terahertz wave technology in food inspection,” Proc. SPIE 6373, 63730R (2006).
[CrossRef]

Ying, Y.

Z. Yan, Y. Ying, H. Zhang, H. Yu, “Research progress of terahertz wave technology in food inspection,” Proc. SPIE 6373, 63730R (2006).
[CrossRef]

Yoshimoto, N.

S. Hisatake, G. Kitahara, K. Ajito, Y. Fukada, N. Yoshimoto, T. Nagatsuma, “Phase-sensitive terahertz self-heterodyne system based on photodiode and low-temperature-grown GaAs photoconductor at 1.55 μm,” IEEE Sens. J. 13(1), 31–36 (2013).
[CrossRef]

Yoshino, K.

Yu, H.

Z. Yan, Y. Ying, H. Zhang, H. Yu, “Research progress of terahertz wave technology in food inspection,” Proc. SPIE 6373, 63730R (2006).
[CrossRef]

Yuasa, T.

Zhang, H.

Z. Yan, Y. Ying, H. Zhang, H. Yu, “Research progress of terahertz wave technology in food inspection,” Proc. SPIE 6373, 63730R (2006).
[CrossRef]

Zimdars, D.

Zorych, I.

Anal. Chem. (1)

D. M. Charron, K. Ajito, J.-Y. Kim, Y. Ueno, “Chemical mapping of pharmaceutical cocrystals using terahertz spectroscopic imaging,” Anal. Chem. 85(4), 1980–1984 (2013).
[CrossRef] [PubMed]

Appl. Opt. (1)

Appl. Phys. Lett. (1)

I. S. Gregory, W. R. Tribe, C. Baker, B. E. Cole, M. J. Evans, L. Spencer, M. Pepper, M. Missous, “Continuous-wave terahertz system with a 60 dB dynamic range,” Appl. Phys. Lett. 86(20), 204104 (2005).
[CrossRef]

Electron. Lett. (1)

T. Göbel, D. Schoenherr, C. Sydlo, M. Feiginov, P. Meissner, H. L. Hartnagel, “Single-sampling-point coherent detection in continuous-wave photomixing terahertz systems,” Electron. Lett. 45(1), 65–66 (2009).
[CrossRef]

IEEE Sens. J. (1)

S. Hisatake, G. Kitahara, K. Ajito, Y. Fukada, N. Yoshimoto, T. Nagatsuma, “Phase-sensitive terahertz self-heterodyne system based on photodiode and low-temperature-grown GaAs photoconductor at 1.55 μm,” IEEE Sens. J. 13(1), 31–36 (2013).
[CrossRef]

IEEE Trans. THz Sci. Tech. (Paris) (3)

J.-Y. Kim, H.-J. Song, K. Ajito, M. Yaita, N. Kukutsu, “Continuous-Wave THz Homodyne Spectroscopy and Imaging System With Electro-Optical Phase Modulation for High Dynamic Range,” IEEE Trans. THz Sci. Tech. (Paris) 3, 158–164 (2013).

F. Friederich, W. V. Spiegel, M. Bauer, F. Meng, M. D. Thomson, S. Boppel, A. Lisauskas, B. Hils, V. Krozer, A. Keil, T. Löffler, R. Henneberger, A. K. Huhn, G. Spickermann, P. H. Bolívar, H. G. Roskos, “THz Active Imaging Systems With Real-Time Capabilities,” IEEE Trans. THz Sci. Tech. (Paris) 1, 183–200 (2011).

K. Ajito, Y. Ueno, “THz Chemical Imaging for Biological Applications,” IEEE Trans. THz Sci. Tech. (Paris) 1, 293–300 (2011).

J. Appl. Phys. (1)

X. Xin, H. Altan, A. Saint, D. Matten, R. R. Alfano, “Terahertz absorption spectrum of para and ortho water vapors at different humidities at room temperature,” J. Appl. Phys. 100(9), 094905 (2006).
[CrossRef]

J. Lightwave Technol. (1)

Nat. Photonics (1)

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

New J. Phys. (1)

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

Opt. Express (3)

Opt. Lett. (3)

Proc. SPIE (2)

J. R. Demers, R. T. Logan, N. J. Bergeron, E. R. Brown, “A coherent frequency-domain THz spectrometer with a signal-to-noise ratio 60 dB at 1 THz,” Proc. SPIE 6949, 694909 (2008).
[CrossRef]

Z. Yan, Y. Ying, H. Zhang, H. Yu, “Research progress of terahertz wave technology in food inspection,” Proc. SPIE 6373, 63730R (2006).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Schematic diagram of CW-THz homodyne spectroscopy and imaging system with EO phase modulation and direct lock-in detection. UTC-PD: Uni-traveling-carrier photodiode. PCA: Photo-conductive antenna.

Fig. 2
Fig. 2

Measured (a) intensity and (b) phase responses of the THz spectroscopy and imaging system from 0.2 to 2 THz through 30-cm-long air path.

Fig. 3
Fig. 3

Measured long-term variation of (a) phase and (b) intensity responses for 1 hour.

Fig. 4
Fig. 4

Measured THz imaging results of multi-component caffeine:oxalic-acid (Caf:Oca) cocrystal tablet with polyethylene (PE). (a) Photograph of tablet and composition of three sections with different Caf:Oxa cocrystal concentrations. (b) Intensity and (c) phase images of the tablet measured at different THz frequencies.

Fig. 5
Fig. 5

THz vector spectroscopy results of (a) absorbance and (b) relative permittivity from measured intensity and phase responses of sampled spatial points in each section of multi-component tablet.

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