Abstract

In 2003, we reported the first-ever development of a spectral imaging system for illicit drugs detection using a terahertz (THz) wave parametric oscillator (TPO) [K. Kawase et al., Opt. Exp. 11(20), 2549 2003]. The system has a dynamic range below four orders of magnitude, which enables it to identify reagents only through thin envelopes using spectral imaging. Recently, we succeeded in developing a high power and high sensitivity THz wave spectral imaging system using injection-seeded THz parametric generation and detection. A dynamic range in excess of 80 dB has been obtained, which is much higher than that of the 2003 system. In this study, the new spectral imaging system successfully identified reagents through thicker material than the thin envelopes used previously.

© 2016 Optical Society of America

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References

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  1. M. Tonouchi, “Cutting-edge terahertz technology,” Nat. Photonics 1(2), 97–105 (2007).
    [Crossref]
  2. K. Kawase, Y. Ogawa, Y. Watanabe, and H. Inoue, “Non-destructive terahertz imaging of illicit drugs using spectral fingerprints,” Opt. Express 11(20), 2549–2554 (2003).
    [Crossref] [PubMed]
  3. K. Kawase, M. Sato, T. Taniuchi, and H. Ito, “Coherent tunable THz-wave generation from LiNbO3 with monolithic grating coupler,” Appl. Phys. Lett. 68(18), 2483–2485 (1996).
    [Crossref]
  4. K. Kawase, J. I. Shikata, K. Imai, and H. Ito, “Transform-limited, narrow-linewidth, terahertz-wave parametric generator,” Appl. Phys. Lett. 78(19), 2819–2821 (2001).
    [Crossref]
  5. K. Kawase, J. I. Shikata, and H. Ito, “Terahertz wave parametric source,” J. Phys. D Appl. Phys. 35(3), R1–R14 (2002).
    [Crossref]
  6. Y. Watanabe, K. Kawase, T. Ikari, H. Ito, Y. Ishikawa, and H. Minamide, “Component analysis of chemical mixtures using terahertz spectroscopic imaging,” Opt. Commun. 234(1), 125–129 (2004).
    [Crossref]
  7. A. D. van Rheenen and M. W. Haakestad, “Robust identification of concealed dangerous substances by spectral correlation of Terahertz transmission images,” IEEE Trans. THz. Sci. Tech. (Paris) 5(3), 438–444 (2015).
  8. U. Puc, A. Abina, M. Rutar, A. Zidanšek, A. Jeglič, and G. Valušis, “Terahertz spectroscopic identification of explosive and drug simulants concealed by various hiding techniques,” Appl. Opt. 54(14), 4495–4502 (2015).
    [Crossref] [PubMed]
  9. H. Hoshina, Y. Sasaki, A. Hayashi, C. Otani, and K. Kawase, “Non-invasive mail inspection system with terahertz radiation,” Appl. Spectrosc. 63(1), 81–86 (2009).
    [Crossref] [PubMed]
  10. M. H. Arbab, D. P. Winebrenner, E. I. Thorsos, and A. Chen, “Retrieval of terahertz spectroscopic signatures in the presence of rough surface scattering using wavelet methods,” Appl. Phys. Lett. 97(18), 181903 (2010).
    [Crossref]
  11. M. Kaushik, B. W. H. Ng, B. M. Fischer, and D. Abbott, “Reduction of scattering effects in THz-TDS signals,” IEEE Photonics Technol. Lett. 24(2), 155–157 (2012).
    [Crossref]
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    [Crossref]
  13. F. Théberge, M. Châteauneuf, J. Dubois, S. Désilets, and L. S. Lussier, “Spectral artifacts from non-uniform samples analyzed by terahertz time-domain spectroscopy,” Opt. Express 17(13), 10841–10848 (2009).
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  14. N. Vieweg, F. Rettich, A. Deninger, H. Roehle, R. Dietz, T. Gobel, and M. Schell, “Terahertz-time domain spectrometer with 90dB peak dynamic range,” J. Inf. Milli. Terahz. Waves 35(10), 823–832 (2014)
  15. H. Minamide, S. I. Hayashi, K. Nawata, T. Taira, J. I. Shikata, and K. Kawase, “Kilowatt-peak terahertz-wave generation and sub-femtojoule terahertz-wave pulse detection based on nonlinear optical wavelength-conversion at room temperature,” J. Inf. Millm. Terahz Wave. 35(1), 25–37 (2014).
  16. S. Hayashi, K. Nawata, T. Taira, J. Shikata, K. Kawase, and H. Minamide, “Ultrabright continuously tunable terahertz-wave generation at room temperature,” Sci. Rep. 4, 5045 (2014).
    [Crossref] [PubMed]
  17. K. Murate, Y. Taira, S. R. Tripathi, S. I. Hayashi, K. Nawata, H. Minamide, and K. Kawase, “A high dynamic range and spectrally flat terahertz spectrometer based on optical parametric processes in LiNbO3,” IEEE Trans. THz. Sci. Tech. 4(4), 523–526 (2014).
  18. K. Imai, K. Kawase, H. Minamide, and H. Ito, “Achromatically injection-seeded terahertz-wave parametric generator,” Opt. Lett. 27(24), 2173–2175 (2002).
    [Crossref] [PubMed]
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2015 (2)

A. D. van Rheenen and M. W. Haakestad, “Robust identification of concealed dangerous substances by spectral correlation of Terahertz transmission images,” IEEE Trans. THz. Sci. Tech. (Paris) 5(3), 438–444 (2015).

U. Puc, A. Abina, M. Rutar, A. Zidanšek, A. Jeglič, and G. Valušis, “Terahertz spectroscopic identification of explosive and drug simulants concealed by various hiding techniques,” Appl. Opt. 54(14), 4495–4502 (2015).
[Crossref] [PubMed]

2014 (4)

N. Vieweg, F. Rettich, A. Deninger, H. Roehle, R. Dietz, T. Gobel, and M. Schell, “Terahertz-time domain spectrometer with 90dB peak dynamic range,” J. Inf. Milli. Terahz. Waves 35(10), 823–832 (2014)

H. Minamide, S. I. Hayashi, K. Nawata, T. Taira, J. I. Shikata, and K. Kawase, “Kilowatt-peak terahertz-wave generation and sub-femtojoule terahertz-wave pulse detection based on nonlinear optical wavelength-conversion at room temperature,” J. Inf. Millm. Terahz Wave. 35(1), 25–37 (2014).

S. Hayashi, K. Nawata, T. Taira, J. Shikata, K. Kawase, and H. Minamide, “Ultrabright continuously tunable terahertz-wave generation at room temperature,” Sci. Rep. 4, 5045 (2014).
[Crossref] [PubMed]

K. Murate, Y. Taira, S. R. Tripathi, S. I. Hayashi, K. Nawata, H. Minamide, and K. Kawase, “A high dynamic range and spectrally flat terahertz spectrometer based on optical parametric processes in LiNbO3,” IEEE Trans. THz. Sci. Tech. 4(4), 523–526 (2014).

2012 (2)

M. Kaushik, B. W. H. Ng, B. M. Fischer, and D. Abbott, “Reduction of scattering effects in THz-TDS signals,” IEEE Photonics Technol. Lett. 24(2), 155–157 (2012).
[Crossref]

M. Kaushik, B. W. H. Ng, B. M. Fischer, and D. Abbott, “Terahertz fingerprinting in presence of quasi-ballistic scattering,” Appl. Phys. Lett. 101(6), 061108 (2012).
[Crossref]

2010 (1)

M. H. Arbab, D. P. Winebrenner, E. I. Thorsos, and A. Chen, “Retrieval of terahertz spectroscopic signatures in the presence of rough surface scattering using wavelet methods,” Appl. Phys. Lett. 97(18), 181903 (2010).
[Crossref]

2009 (2)

2007 (1)

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

2004 (1)

Y. Watanabe, K. Kawase, T. Ikari, H. Ito, Y. Ishikawa, and H. Minamide, “Component analysis of chemical mixtures using terahertz spectroscopic imaging,” Opt. Commun. 234(1), 125–129 (2004).
[Crossref]

2003 (1)

2002 (2)

K. Kawase, J. I. Shikata, and H. Ito, “Terahertz wave parametric source,” J. Phys. D Appl. Phys. 35(3), R1–R14 (2002).
[Crossref]

K. Imai, K. Kawase, H. Minamide, and H. Ito, “Achromatically injection-seeded terahertz-wave parametric generator,” Opt. Lett. 27(24), 2173–2175 (2002).
[Crossref] [PubMed]

2001 (1)

K. Kawase, J. I. Shikata, K. Imai, and H. Ito, “Transform-limited, narrow-linewidth, terahertz-wave parametric generator,” Appl. Phys. Lett. 78(19), 2819–2821 (2001).
[Crossref]

1996 (1)

K. Kawase, M. Sato, T. Taniuchi, and H. Ito, “Coherent tunable THz-wave generation from LiNbO3 with monolithic grating coupler,” Appl. Phys. Lett. 68(18), 2483–2485 (1996).
[Crossref]

1987 (1)

Abbott, D.

M. Kaushik, B. W. H. Ng, B. M. Fischer, and D. Abbott, “Reduction of scattering effects in THz-TDS signals,” IEEE Photonics Technol. Lett. 24(2), 155–157 (2012).
[Crossref]

M. Kaushik, B. W. H. Ng, B. M. Fischer, and D. Abbott, “Terahertz fingerprinting in presence of quasi-ballistic scattering,” Appl. Phys. Lett. 101(6), 061108 (2012).
[Crossref]

Abina, A.

Arbab, M. H.

M. H. Arbab, D. P. Winebrenner, E. I. Thorsos, and A. Chen, “Retrieval of terahertz spectroscopic signatures in the presence of rough surface scattering using wavelet methods,” Appl. Phys. Lett. 97(18), 181903 (2010).
[Crossref]

Châteauneuf, M.

Chen, A.

M. H. Arbab, D. P. Winebrenner, E. I. Thorsos, and A. Chen, “Retrieval of terahertz spectroscopic signatures in the presence of rough surface scattering using wavelet methods,” Appl. Phys. Lett. 97(18), 181903 (2010).
[Crossref]

Deninger, A.

N. Vieweg, F. Rettich, A. Deninger, H. Roehle, R. Dietz, T. Gobel, and M. Schell, “Terahertz-time domain spectrometer with 90dB peak dynamic range,” J. Inf. Milli. Terahz. Waves 35(10), 823–832 (2014)

Désilets, S.

Dietz, R.

N. Vieweg, F. Rettich, A. Deninger, H. Roehle, R. Dietz, T. Gobel, and M. Schell, “Terahertz-time domain spectrometer with 90dB peak dynamic range,” J. Inf. Milli. Terahz. Waves 35(10), 823–832 (2014)

Dubois, J.

Fischer, B. M.

M. Kaushik, B. W. H. Ng, B. M. Fischer, and D. Abbott, “Terahertz fingerprinting in presence of quasi-ballistic scattering,” Appl. Phys. Lett. 101(6), 061108 (2012).
[Crossref]

M. Kaushik, B. W. H. Ng, B. M. Fischer, and D. Abbott, “Reduction of scattering effects in THz-TDS signals,” IEEE Photonics Technol. Lett. 24(2), 155–157 (2012).
[Crossref]

Gobel, T.

N. Vieweg, F. Rettich, A. Deninger, H. Roehle, R. Dietz, T. Gobel, and M. Schell, “Terahertz-time domain spectrometer with 90dB peak dynamic range,” J. Inf. Milli. Terahz. Waves 35(10), 823–832 (2014)

Haakestad, M. W.

A. D. van Rheenen and M. W. Haakestad, “Robust identification of concealed dangerous substances by spectral correlation of Terahertz transmission images,” IEEE Trans. THz. Sci. Tech. (Paris) 5(3), 438–444 (2015).

Hayashi, A.

Hayashi, S.

S. Hayashi, K. Nawata, T. Taira, J. Shikata, K. Kawase, and H. Minamide, “Ultrabright continuously tunable terahertz-wave generation at room temperature,” Sci. Rep. 4, 5045 (2014).
[Crossref] [PubMed]

Hayashi, S. I.

H. Minamide, S. I. Hayashi, K. Nawata, T. Taira, J. I. Shikata, and K. Kawase, “Kilowatt-peak terahertz-wave generation and sub-femtojoule terahertz-wave pulse detection based on nonlinear optical wavelength-conversion at room temperature,” J. Inf. Millm. Terahz Wave. 35(1), 25–37 (2014).

K. Murate, Y. Taira, S. R. Tripathi, S. I. Hayashi, K. Nawata, H. Minamide, and K. Kawase, “A high dynamic range and spectrally flat terahertz spectrometer based on optical parametric processes in LiNbO3,” IEEE Trans. THz. Sci. Tech. 4(4), 523–526 (2014).

Hoshina, H.

Ikari, T.

Y. Watanabe, K. Kawase, T. Ikari, H. Ito, Y. Ishikawa, and H. Minamide, “Component analysis of chemical mixtures using terahertz spectroscopic imaging,” Opt. Commun. 234(1), 125–129 (2004).
[Crossref]

Imai, K.

K. Imai, K. Kawase, H. Minamide, and H. Ito, “Achromatically injection-seeded terahertz-wave parametric generator,” Opt. Lett. 27(24), 2173–2175 (2002).
[Crossref] [PubMed]

K. Kawase, J. I. Shikata, K. Imai, and H. Ito, “Transform-limited, narrow-linewidth, terahertz-wave parametric generator,” Appl. Phys. Lett. 78(19), 2819–2821 (2001).
[Crossref]

Inoue, H.

Ishikawa, Y.

Y. Watanabe, K. Kawase, T. Ikari, H. Ito, Y. Ishikawa, and H. Minamide, “Component analysis of chemical mixtures using terahertz spectroscopic imaging,” Opt. Commun. 234(1), 125–129 (2004).
[Crossref]

Ito, H.

Y. Watanabe, K. Kawase, T. Ikari, H. Ito, Y. Ishikawa, and H. Minamide, “Component analysis of chemical mixtures using terahertz spectroscopic imaging,” Opt. Commun. 234(1), 125–129 (2004).
[Crossref]

K. Kawase, J. I. Shikata, and H. Ito, “Terahertz wave parametric source,” J. Phys. D Appl. Phys. 35(3), R1–R14 (2002).
[Crossref]

K. Imai, K. Kawase, H. Minamide, and H. Ito, “Achromatically injection-seeded terahertz-wave parametric generator,” Opt. Lett. 27(24), 2173–2175 (2002).
[Crossref] [PubMed]

K. Kawase, J. I. Shikata, K. Imai, and H. Ito, “Transform-limited, narrow-linewidth, terahertz-wave parametric generator,” Appl. Phys. Lett. 78(19), 2819–2821 (2001).
[Crossref]

K. Kawase, M. Sato, T. Taniuchi, and H. Ito, “Coherent tunable THz-wave generation from LiNbO3 with monolithic grating coupler,” Appl. Phys. Lett. 68(18), 2483–2485 (1996).
[Crossref]

Jeglic, A.

Kaushik, M.

M. Kaushik, B. W. H. Ng, B. M. Fischer, and D. Abbott, “Terahertz fingerprinting in presence of quasi-ballistic scattering,” Appl. Phys. Lett. 101(6), 061108 (2012).
[Crossref]

M. Kaushik, B. W. H. Ng, B. M. Fischer, and D. Abbott, “Reduction of scattering effects in THz-TDS signals,” IEEE Photonics Technol. Lett. 24(2), 155–157 (2012).
[Crossref]

Kawase, K.

K. Murate, Y. Taira, S. R. Tripathi, S. I. Hayashi, K. Nawata, H. Minamide, and K. Kawase, “A high dynamic range and spectrally flat terahertz spectrometer based on optical parametric processes in LiNbO3,” IEEE Trans. THz. Sci. Tech. 4(4), 523–526 (2014).

S. Hayashi, K. Nawata, T. Taira, J. Shikata, K. Kawase, and H. Minamide, “Ultrabright continuously tunable terahertz-wave generation at room temperature,” Sci. Rep. 4, 5045 (2014).
[Crossref] [PubMed]

H. Minamide, S. I. Hayashi, K. Nawata, T. Taira, J. I. Shikata, and K. Kawase, “Kilowatt-peak terahertz-wave generation and sub-femtojoule terahertz-wave pulse detection based on nonlinear optical wavelength-conversion at room temperature,” J. Inf. Millm. Terahz Wave. 35(1), 25–37 (2014).

H. Hoshina, Y. Sasaki, A. Hayashi, C. Otani, and K. Kawase, “Non-invasive mail inspection system with terahertz radiation,” Appl. Spectrosc. 63(1), 81–86 (2009).
[Crossref] [PubMed]

Y. Watanabe, K. Kawase, T. Ikari, H. Ito, Y. Ishikawa, and H. Minamide, “Component analysis of chemical mixtures using terahertz spectroscopic imaging,” Opt. Commun. 234(1), 125–129 (2004).
[Crossref]

K. Kawase, Y. Ogawa, Y. Watanabe, and H. Inoue, “Non-destructive terahertz imaging of illicit drugs using spectral fingerprints,” Opt. Express 11(20), 2549–2554 (2003).
[Crossref] [PubMed]

K. Imai, K. Kawase, H. Minamide, and H. Ito, “Achromatically injection-seeded terahertz-wave parametric generator,” Opt. Lett. 27(24), 2173–2175 (2002).
[Crossref] [PubMed]

K. Kawase, J. I. Shikata, and H. Ito, “Terahertz wave parametric source,” J. Phys. D Appl. Phys. 35(3), R1–R14 (2002).
[Crossref]

K. Kawase, J. I. Shikata, K. Imai, and H. Ito, “Transform-limited, narrow-linewidth, terahertz-wave parametric generator,” Appl. Phys. Lett. 78(19), 2819–2821 (2001).
[Crossref]

K. Kawase, M. Sato, T. Taniuchi, and H. Ito, “Coherent tunable THz-wave generation from LiNbO3 with monolithic grating coupler,” Appl. Phys. Lett. 68(18), 2483–2485 (1996).
[Crossref]

Kawata, S.

Lussier, L. S.

Minami, S.

Minamide, H.

K. Murate, Y. Taira, S. R. Tripathi, S. I. Hayashi, K. Nawata, H. Minamide, and K. Kawase, “A high dynamic range and spectrally flat terahertz spectrometer based on optical parametric processes in LiNbO3,” IEEE Trans. THz. Sci. Tech. 4(4), 523–526 (2014).

H. Minamide, S. I. Hayashi, K. Nawata, T. Taira, J. I. Shikata, and K. Kawase, “Kilowatt-peak terahertz-wave generation and sub-femtojoule terahertz-wave pulse detection based on nonlinear optical wavelength-conversion at room temperature,” J. Inf. Millm. Terahz Wave. 35(1), 25–37 (2014).

S. Hayashi, K. Nawata, T. Taira, J. Shikata, K. Kawase, and H. Minamide, “Ultrabright continuously tunable terahertz-wave generation at room temperature,” Sci. Rep. 4, 5045 (2014).
[Crossref] [PubMed]

Y. Watanabe, K. Kawase, T. Ikari, H. Ito, Y. Ishikawa, and H. Minamide, “Component analysis of chemical mixtures using terahertz spectroscopic imaging,” Opt. Commun. 234(1), 125–129 (2004).
[Crossref]

K. Imai, K. Kawase, H. Minamide, and H. Ito, “Achromatically injection-seeded terahertz-wave parametric generator,” Opt. Lett. 27(24), 2173–2175 (2002).
[Crossref] [PubMed]

Murate, K.

K. Murate, Y. Taira, S. R. Tripathi, S. I. Hayashi, K. Nawata, H. Minamide, and K. Kawase, “A high dynamic range and spectrally flat terahertz spectrometer based on optical parametric processes in LiNbO3,” IEEE Trans. THz. Sci. Tech. 4(4), 523–526 (2014).

Nawata, K.

K. Murate, Y. Taira, S. R. Tripathi, S. I. Hayashi, K. Nawata, H. Minamide, and K. Kawase, “A high dynamic range and spectrally flat terahertz spectrometer based on optical parametric processes in LiNbO3,” IEEE Trans. THz. Sci. Tech. 4(4), 523–526 (2014).

H. Minamide, S. I. Hayashi, K. Nawata, T. Taira, J. I. Shikata, and K. Kawase, “Kilowatt-peak terahertz-wave generation and sub-femtojoule terahertz-wave pulse detection based on nonlinear optical wavelength-conversion at room temperature,” J. Inf. Millm. Terahz Wave. 35(1), 25–37 (2014).

S. Hayashi, K. Nawata, T. Taira, J. Shikata, K. Kawase, and H. Minamide, “Ultrabright continuously tunable terahertz-wave generation at room temperature,” Sci. Rep. 4, 5045 (2014).
[Crossref] [PubMed]

Ng, B. W. H.

M. Kaushik, B. W. H. Ng, B. M. Fischer, and D. Abbott, “Reduction of scattering effects in THz-TDS signals,” IEEE Photonics Technol. Lett. 24(2), 155–157 (2012).
[Crossref]

M. Kaushik, B. W. H. Ng, B. M. Fischer, and D. Abbott, “Terahertz fingerprinting in presence of quasi-ballistic scattering,” Appl. Phys. Lett. 101(6), 061108 (2012).
[Crossref]

Ogawa, Y.

Otani, C.

Puc, U.

Rettich, F.

N. Vieweg, F. Rettich, A. Deninger, H. Roehle, R. Dietz, T. Gobel, and M. Schell, “Terahertz-time domain spectrometer with 90dB peak dynamic range,” J. Inf. Milli. Terahz. Waves 35(10), 823–832 (2014)

Roehle, H.

N. Vieweg, F. Rettich, A. Deninger, H. Roehle, R. Dietz, T. Gobel, and M. Schell, “Terahertz-time domain spectrometer with 90dB peak dynamic range,” J. Inf. Milli. Terahz. Waves 35(10), 823–832 (2014)

Rutar, M.

Sasaki, K.

Sasaki, Y.

Sato, M.

K. Kawase, M. Sato, T. Taniuchi, and H. Ito, “Coherent tunable THz-wave generation from LiNbO3 with monolithic grating coupler,” Appl. Phys. Lett. 68(18), 2483–2485 (1996).
[Crossref]

Schell, M.

N. Vieweg, F. Rettich, A. Deninger, H. Roehle, R. Dietz, T. Gobel, and M. Schell, “Terahertz-time domain spectrometer with 90dB peak dynamic range,” J. Inf. Milli. Terahz. Waves 35(10), 823–832 (2014)

Shikata, J.

S. Hayashi, K. Nawata, T. Taira, J. Shikata, K. Kawase, and H. Minamide, “Ultrabright continuously tunable terahertz-wave generation at room temperature,” Sci. Rep. 4, 5045 (2014).
[Crossref] [PubMed]

Shikata, J. I.

H. Minamide, S. I. Hayashi, K. Nawata, T. Taira, J. I. Shikata, and K. Kawase, “Kilowatt-peak terahertz-wave generation and sub-femtojoule terahertz-wave pulse detection based on nonlinear optical wavelength-conversion at room temperature,” J. Inf. Millm. Terahz Wave. 35(1), 25–37 (2014).

K. Kawase, J. I. Shikata, and H. Ito, “Terahertz wave parametric source,” J. Phys. D Appl. Phys. 35(3), R1–R14 (2002).
[Crossref]

K. Kawase, J. I. Shikata, K. Imai, and H. Ito, “Transform-limited, narrow-linewidth, terahertz-wave parametric generator,” Appl. Phys. Lett. 78(19), 2819–2821 (2001).
[Crossref]

Taira, T.

H. Minamide, S. I. Hayashi, K. Nawata, T. Taira, J. I. Shikata, and K. Kawase, “Kilowatt-peak terahertz-wave generation and sub-femtojoule terahertz-wave pulse detection based on nonlinear optical wavelength-conversion at room temperature,” J. Inf. Millm. Terahz Wave. 35(1), 25–37 (2014).

S. Hayashi, K. Nawata, T. Taira, J. Shikata, K. Kawase, and H. Minamide, “Ultrabright continuously tunable terahertz-wave generation at room temperature,” Sci. Rep. 4, 5045 (2014).
[Crossref] [PubMed]

Taira, Y.

K. Murate, Y. Taira, S. R. Tripathi, S. I. Hayashi, K. Nawata, H. Minamide, and K. Kawase, “A high dynamic range and spectrally flat terahertz spectrometer based on optical parametric processes in LiNbO3,” IEEE Trans. THz. Sci. Tech. 4(4), 523–526 (2014).

Taniuchi, T.

K. Kawase, M. Sato, T. Taniuchi, and H. Ito, “Coherent tunable THz-wave generation from LiNbO3 with monolithic grating coupler,” Appl. Phys. Lett. 68(18), 2483–2485 (1996).
[Crossref]

Théberge, F.

Thorsos, E. I.

M. H. Arbab, D. P. Winebrenner, E. I. Thorsos, and A. Chen, “Retrieval of terahertz spectroscopic signatures in the presence of rough surface scattering using wavelet methods,” Appl. Phys. Lett. 97(18), 181903 (2010).
[Crossref]

Tonouchi, M.

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

Tripathi, S. R.

K. Murate, Y. Taira, S. R. Tripathi, S. I. Hayashi, K. Nawata, H. Minamide, and K. Kawase, “A high dynamic range and spectrally flat terahertz spectrometer based on optical parametric processes in LiNbO3,” IEEE Trans. THz. Sci. Tech. 4(4), 523–526 (2014).

Valušis, G.

van Rheenen, A. D.

A. D. van Rheenen and M. W. Haakestad, “Robust identification of concealed dangerous substances by spectral correlation of Terahertz transmission images,” IEEE Trans. THz. Sci. Tech. (Paris) 5(3), 438–444 (2015).

Vieweg, N.

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N. Vieweg, F. Rettich, A. Deninger, H. Roehle, R. Dietz, T. Gobel, and M. Schell, “Terahertz-time domain spectrometer with 90dB peak dynamic range,” J. Inf. Milli. Terahz. Waves 35(10), 823–832 (2014)

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[Crossref]

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S. Hayashi, K. Nawata, T. Taira, J. Shikata, K. Kawase, and H. Minamide, “Ultrabright continuously tunable terahertz-wave generation at room temperature,” Sci. Rep. 4, 5045 (2014).
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Figures (7)

Fig. 1
Fig. 1 Terahertz (THz) spectral imaging system.
Fig. 2
Fig. 2 Variable wavelength range and dynamic range of the injection-seeded THz parametric generation (is-TPG) system.
Fig. 3
Fig. 3 Sample preparation (a) Saccharide powders, (b) Covering materials (EMS envelope (top), cardboard (left), and bubble wrap (right)), (c) covered form (front), and (d) covered form (side).
Fig. 4
Fig. 4 Multi-spectral images.
Fig. 5
Fig. 5 Absorption spectrum of each saccharide sample measured by the is-TPG system.
Fig. 6
Fig. 6 Spectral imaging results (from the top: maltose, glucose, and fructose).
Fig. 7
Fig. 7 One-pixel absorption spectrum of each saccharide sample. The arrow head shows the absorption peak of each sample.

Tables (1)

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Table 1 Comparison between the TPO used in 2003 and the is-TPG used in this study

Equations (3)

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[ X ]=[ S ][ C ]
[ C ]= [ S ] 1 [ X ]
[ C ]= ( [ S ] t [ S ] ) 1 [ S ] t [ X ]

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