Abstract

A real-time THz color scanner has the potential to further expand the application scope of THz spectral imaging based on its rapid image acquisition rate. We demonstrated three possible applications of a THz color scanner in the biomedical field: imaging of pharmaceutical tablets, human teeth, and human hair. The first application showed the scanner’s potential in total inspection for rapid quality control of pharmaceutical tablets moving on a conveyor belt. The second application demonstrated that the scanner can be used to identify a potential indicator for crystallinity of dental tissue. In the third application, the scanner was successfully used to visualize the drying process of wet hairs. These demonstrations indicated the high potential of the THz color scanner for practical applications in the biomedical field.

© 2010 OSA

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  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), http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-11-20-2549 .
    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef]
  6. K. Fukunaga, Y. Ogawa, S. Hayashi, and I. Hosako, “Terahertz spectroscopy for art conservation,” IEICE Electron. Express 4(8), 258–263 (2007).
    [CrossRef]
  7. T. Yasuda, T. Yasui, T. Araki, and E. Abraham, “Real-time two-dimensional terahertz tomography of moving objects,” Opt. Commun. 267(1), 128–136 (2006).
    [CrossRef]
  8. J. Shan, A. S. Weling, E. Knoesel, L. Bartels, M. Bonn, A. Nahata, G. A. Reider, and T. F. Heinz, “Single-shot measurement of terahertz electromagnetic pulses by use of electro-optic sampling,” Opt. Lett. 25(6), 426–428 (2000).
    [CrossRef] [PubMed]
  9. T. Yasui, K. Sawanaka, A. Ihara, E. Abraham, M. Hashimoto, and T. Araki, “Real-time terahertz color scanner for moving objects,” Opt. Express 16(2), 1208–1221 (2008), http://www.opticsinfobase.org/abstract.cfm?URI=oe-16-2-1208 .
    [CrossRef] [PubMed]
  10. F. Miyamaru, T. Yonera, M. Tani, and M. Hangyo, “Terahertz two-dimensional electrooptic sampling using high speed complementary metal-oxide semiconductor camera,” Jpn. J. Appl. Phys. 43(No. 4A), L489–L491 (2004).
    [CrossRef]
  11. M. Naftaly and R. Dudley, “Methodologies for determining the dynamic ranges and signal-to-noise ratios of terahertz time-domain spectrometers,” Opt. Lett. 34(8), 1213–1215 (2009).
    [CrossRef] [PubMed]
  12. J. T. Kindt and C. A. Schmuttenmaer, “Far-infrared dielectric properties of polar liquids probed by femtosecond terahertz pulse spectroscopy,” J. Phys. Chem. 100(24), 10373–10379 (1996).
    [CrossRef]
  13. Y. Sun, B. M. Fischer, and E. Pickwell-MacPherson, “Effects of formalin fixing on the terahertz properties of biological tissues,” J. Biomed. Opt. 14(6), 064017 (2009).
    [CrossRef] [PubMed]
  14. H. Hoshina, A. Hayashi, N. Miyoshi, F. Miyamaru, and C. Otani, “Terahertz pulsed imaging of frozen biological tissues,” Appl. Phys. Lett. 94(12), 123901 (2009).
    [CrossRef]
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    [CrossRef] [PubMed]
  16. A. G. Markelz, A. Roitberg, and E. J. Heilweil, “Pulsed terahertz spectroscopy of DNA, bovine serum albumin and collagen between 0.1 and 2.0 THz,” Chem. Phys. Lett. 320(1-2), 42–48 (2000).
    [CrossRef]
  17. Y. C. Shen, P. F. Taday, and M. Pepper, “Elimination of scattering effects in spectral measurement of granulated materials using terahertz pulsed spectroscopy,” Appl. Phys. Lett. 92(5), 051103 (2008).
    [CrossRef]
  18. C. M. Pande and B. Yang, “Near-infrared spectroscopy: Applications in hair research,” J. Cosmet. Sci. 51, 183–192 (2000).
  19. D. M. Mittleman, R. H. Jacobsen, and M. C. Nuss, “T-ray imaging,” IEEE J. Sel. Top. Quantum Electron. 2(3), 679–692 (1996).
    [CrossRef]
  20. T. Yasui and T. Araki, “Sensitive measurement of water content in dry material based on low-frequency terahertz time-domain spectroscopy,” Proc. SPIE 6024(60240A), 69–74 (2005).
  21. D. Banerjee, W. von Spiegel, M. D. Thomson, S. Schabel, and H. G. Roskos, “Diagnosing water content in paper by terahertz radiation,” Opt. Express 16(12), 9060–9066 (2008), http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-12-9060 .
    [CrossRef] [PubMed]
  22. A. G. Stepanov, J. Hebling, and J. Kuhl, “Efficient generation of subpicosecond terahertz radiation by phase-matched optical rectification using ultrashort laser pulses with tilted pulse fronts,” Appl. Phys. Lett. 83(15), 3000–3002 (2003).
    [CrossRef]
  23. H. Zhong, N. Karpowicz, and X.-C. Zhang, “Terahertz emission profile from laser-induced air plasma,” Appl. Phys. Lett. 88(26), 261103 (2006).
    [CrossRef]

2009

Y. Sun, B. M. Fischer, and E. Pickwell-MacPherson, “Effects of formalin fixing on the terahertz properties of biological tissues,” J. Biomed. Opt. 14(6), 064017 (2009).
[CrossRef] [PubMed]

H. Hoshina, A. Hayashi, N. Miyoshi, F. Miyamaru, and C. Otani, “Terahertz pulsed imaging of frozen biological tissues,” Appl. Phys. Lett. 94(12), 123901 (2009).
[CrossRef]

M. Naftaly and R. Dudley, “Methodologies for determining the dynamic ranges and signal-to-noise ratios of terahertz time-domain spectrometers,” Opt. Lett. 34(8), 1213–1215 (2009).
[CrossRef] [PubMed]

2008

T. Yasui, K. Sawanaka, A. Ihara, E. Abraham, M. Hashimoto, and T. Araki, “Real-time terahertz color scanner for moving objects,” Opt. Express 16(2), 1208–1221 (2008), http://www.opticsinfobase.org/abstract.cfm?URI=oe-16-2-1208 .
[CrossRef] [PubMed]

D. Banerjee, W. von Spiegel, M. D. Thomson, S. Schabel, and H. G. Roskos, “Diagnosing water content in paper by terahertz radiation,” Opt. Express 16(12), 9060–9066 (2008), http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-12-9060 .
[CrossRef] [PubMed]

Y.-C. Shen and P. F. Taday, “Development and application of terahertz pulsed imaging for non destructive inspection of pharmaceutical tablet,” IEEE J. Sel. Top. Quantum Electron. 14(2), 407–415 (2008).
[CrossRef]

Y. C. Shen, P. F. Taday, and M. Pepper, “Elimination of scattering effects in spectral measurement of granulated materials using terahertz pulsed spectroscopy,” Appl. Phys. Lett. 92(5), 051103 (2008).
[CrossRef]

2007

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

K. Fukunaga, Y. Ogawa, S. Hayashi, and I. Hosako, “Terahertz spectroscopy for art conservation,” IEICE Electron. Express 4(8), 258–263 (2007).
[CrossRef]

2006

T. Yasuda, T. Yasui, T. Araki, and E. Abraham, “Real-time two-dimensional terahertz tomography of moving objects,” Opt. Commun. 267(1), 128–136 (2006).
[CrossRef]

H. Zhong, N. Karpowicz, and X.-C. Zhang, “Terahertz emission profile from laser-induced air plasma,” Appl. Phys. Lett. 88(26), 261103 (2006).
[CrossRef]

2005

T. Yasui and T. Araki, “Sensitive measurement of water content in dry material based on low-frequency terahertz time-domain spectroscopy,” Proc. SPIE 6024(60240A), 69–74 (2005).

Y.-C. Shen, T. Lo, P. F. Taday, B. E. Cole, W. R. Tribe, and M. C. Kemp, “Detection and identification of explosives using terahertz pulsed spectroscopic imaging,” Appl. Phys. Lett. 86(24), 241116 (2005).
[CrossRef]

2004

F. Miyamaru, T. Yonera, M. Tani, and M. Hangyo, “Terahertz two-dimensional electrooptic sampling using high speed complementary metal-oxide semiconductor camera,” Jpn. J. Appl. Phys. 43(No. 4A), L489–L491 (2004).
[CrossRef]

2003

A. G. Stepanov, J. Hebling, and J. Kuhl, “Efficient generation of subpicosecond terahertz radiation by phase-matched optical rectification using ultrashort laser pulses with tilted pulse fronts,” Appl. Phys. Lett. 83(15), 3000–3002 (2003).
[CrossRef]

D. Crawley, C. Longbottom, V. P. Wallace, B. Cole, D. Arnone, and M. Pepper, “Three-dimensional terahertz pulse imaging of dental tissue,” J. Biomed. Opt. 8(2), 303–307 (2003).
[CrossRef] [PubMed]

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), http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-11-20-2549 .
[CrossRef] [PubMed]

2001

2000

A. G. Markelz, A. Roitberg, and E. J. Heilweil, “Pulsed terahertz spectroscopy of DNA, bovine serum albumin and collagen between 0.1 and 2.0 THz,” Chem. Phys. Lett. 320(1-2), 42–48 (2000).
[CrossRef]

J. Shan, A. S. Weling, E. Knoesel, L. Bartels, M. Bonn, A. Nahata, G. A. Reider, and T. F. Heinz, “Single-shot measurement of terahertz electromagnetic pulses by use of electro-optic sampling,” Opt. Lett. 25(6), 426–428 (2000).
[CrossRef] [PubMed]

C. M. Pande and B. Yang, “Near-infrared spectroscopy: Applications in hair research,” J. Cosmet. Sci. 51, 183–192 (2000).

1996

D. M. Mittleman, R. H. Jacobsen, and M. C. Nuss, “T-ray imaging,” IEEE J. Sel. Top. Quantum Electron. 2(3), 679–692 (1996).
[CrossRef]

J. T. Kindt and C. A. Schmuttenmaer, “Far-infrared dielectric properties of polar liquids probed by femtosecond terahertz pulse spectroscopy,” J. Phys. Chem. 100(24), 10373–10379 (1996).
[CrossRef]

Abraham, E.

Araki, T.

T. Yasui, K. Sawanaka, A. Ihara, E. Abraham, M. Hashimoto, and T. Araki, “Real-time terahertz color scanner for moving objects,” Opt. Express 16(2), 1208–1221 (2008), http://www.opticsinfobase.org/abstract.cfm?URI=oe-16-2-1208 .
[CrossRef] [PubMed]

T. Yasuda, T. Yasui, T. Araki, and E. Abraham, “Real-time two-dimensional terahertz tomography of moving objects,” Opt. Commun. 267(1), 128–136 (2006).
[CrossRef]

T. Yasui and T. Araki, “Sensitive measurement of water content in dry material based on low-frequency terahertz time-domain spectroscopy,” Proc. SPIE 6024(60240A), 69–74 (2005).

Arnone, D.

D. Crawley, C. Longbottom, V. P. Wallace, B. Cole, D. Arnone, and M. Pepper, “Three-dimensional terahertz pulse imaging of dental tissue,” J. Biomed. Opt. 8(2), 303–307 (2003).
[CrossRef] [PubMed]

Banerjee, D.

Bartels, L.

Bauer, T.

Bonn, M.

Cole, B.

D. Crawley, C. Longbottom, V. P. Wallace, B. Cole, D. Arnone, and M. Pepper, “Three-dimensional terahertz pulse imaging of dental tissue,” J. Biomed. Opt. 8(2), 303–307 (2003).
[CrossRef] [PubMed]

Cole, B. E.

Y.-C. Shen, T. Lo, P. F. Taday, B. E. Cole, W. R. Tribe, and M. C. Kemp, “Detection and identification of explosives using terahertz pulsed spectroscopic imaging,” Appl. Phys. Lett. 86(24), 241116 (2005).
[CrossRef]

Crawley, D.

D. Crawley, C. Longbottom, V. P. Wallace, B. Cole, D. Arnone, and M. Pepper, “Three-dimensional terahertz pulse imaging of dental tissue,” J. Biomed. Opt. 8(2), 303–307 (2003).
[CrossRef] [PubMed]

Czasch, S.

Dudley, R.

Fischer, B. M.

Y. Sun, B. M. Fischer, and E. Pickwell-MacPherson, “Effects of formalin fixing on the terahertz properties of biological tissues,” J. Biomed. Opt. 14(6), 064017 (2009).
[CrossRef] [PubMed]

Fitzgerald, A.

Fukunaga, K.

K. Fukunaga, Y. Ogawa, S. Hayashi, and I. Hosako, “Terahertz spectroscopy for art conservation,” IEICE Electron. Express 4(8), 258–263 (2007).
[CrossRef]

Hangyo, M.

F. Miyamaru, T. Yonera, M. Tani, and M. Hangyo, “Terahertz two-dimensional electrooptic sampling using high speed complementary metal-oxide semiconductor camera,” Jpn. J. Appl. Phys. 43(No. 4A), L489–L491 (2004).
[CrossRef]

Hashimoto, M.

Hayashi, A.

H. Hoshina, A. Hayashi, N. Miyoshi, F. Miyamaru, and C. Otani, “Terahertz pulsed imaging of frozen biological tissues,” Appl. Phys. Lett. 94(12), 123901 (2009).
[CrossRef]

Hayashi, S.

K. Fukunaga, Y. Ogawa, S. Hayashi, and I. Hosako, “Terahertz spectroscopy for art conservation,” IEICE Electron. Express 4(8), 258–263 (2007).
[CrossRef]

Hebling, J.

A. G. Stepanov, J. Hebling, and J. Kuhl, “Efficient generation of subpicosecond terahertz radiation by phase-matched optical rectification using ultrashort laser pulses with tilted pulse fronts,” Appl. Phys. Lett. 83(15), 3000–3002 (2003).
[CrossRef]

Heilweil, E. J.

A. G. Markelz, A. Roitberg, and E. J. Heilweil, “Pulsed terahertz spectroscopy of DNA, bovine serum albumin and collagen between 0.1 and 2.0 THz,” Chem. Phys. Lett. 320(1-2), 42–48 (2000).
[CrossRef]

Heinz, T. F.

Hosako, I.

K. Fukunaga, Y. Ogawa, S. Hayashi, and I. Hosako, “Terahertz spectroscopy for art conservation,” IEICE Electron. Express 4(8), 258–263 (2007).
[CrossRef]

Hoshina, H.

H. Hoshina, A. Hayashi, N. Miyoshi, F. Miyamaru, and C. Otani, “Terahertz pulsed imaging of frozen biological tissues,” Appl. Phys. Lett. 94(12), 123901 (2009).
[CrossRef]

Ihara, A.

Inoue, H.

Jacobsen, R. H.

D. M. Mittleman, R. H. Jacobsen, and M. C. Nuss, “T-ray imaging,” IEEE J. Sel. Top. Quantum Electron. 2(3), 679–692 (1996).
[CrossRef]

Karpowicz, N.

H. Zhong, N. Karpowicz, and X.-C. Zhang, “Terahertz emission profile from laser-induced air plasma,” Appl. Phys. Lett. 88(26), 261103 (2006).
[CrossRef]

Kawase, K.

Kemp, M. C.

Y.-C. Shen, T. Lo, P. F. Taday, B. E. Cole, W. R. Tribe, and M. C. Kemp, “Detection and identification of explosives using terahertz pulsed spectroscopic imaging,” Appl. Phys. Lett. 86(24), 241116 (2005).
[CrossRef]

Kindt, J. T.

J. T. Kindt and C. A. Schmuttenmaer, “Far-infrared dielectric properties of polar liquids probed by femtosecond terahertz pulse spectroscopy,” J. Phys. Chem. 100(24), 10373–10379 (1996).
[CrossRef]

Knoesel, E.

Kuhl, J.

A. G. Stepanov, J. Hebling, and J. Kuhl, “Efficient generation of subpicosecond terahertz radiation by phase-matched optical rectification using ultrashort laser pulses with tilted pulse fronts,” Appl. Phys. Lett. 83(15), 3000–3002 (2003).
[CrossRef]

Lo, T.

Y.-C. Shen, T. Lo, P. F. Taday, B. E. Cole, W. R. Tribe, and M. C. Kemp, “Detection and identification of explosives using terahertz pulsed spectroscopic imaging,” Appl. Phys. Lett. 86(24), 241116 (2005).
[CrossRef]

Löffler, T.

Longbottom, C.

D. Crawley, C. Longbottom, V. P. Wallace, B. Cole, D. Arnone, and M. Pepper, “Three-dimensional terahertz pulse imaging of dental tissue,” J. Biomed. Opt. 8(2), 303–307 (2003).
[CrossRef] [PubMed]

Markelz, A. G.

A. G. Markelz, A. Roitberg, and E. J. Heilweil, “Pulsed terahertz spectroscopy of DNA, bovine serum albumin and collagen between 0.1 and 2.0 THz,” Chem. Phys. Lett. 320(1-2), 42–48 (2000).
[CrossRef]

Mittleman, D. M.

D. M. Mittleman, R. H. Jacobsen, and M. C. Nuss, “T-ray imaging,” IEEE J. Sel. Top. Quantum Electron. 2(3), 679–692 (1996).
[CrossRef]

Miyamaru, F.

H. Hoshina, A. Hayashi, N. Miyoshi, F. Miyamaru, and C. Otani, “Terahertz pulsed imaging of frozen biological tissues,” Appl. Phys. Lett. 94(12), 123901 (2009).
[CrossRef]

F. Miyamaru, T. Yonera, M. Tani, and M. Hangyo, “Terahertz two-dimensional electrooptic sampling using high speed complementary metal-oxide semiconductor camera,” Jpn. J. Appl. Phys. 43(No. 4A), L489–L491 (2004).
[CrossRef]

Miyoshi, N.

H. Hoshina, A. Hayashi, N. Miyoshi, F. Miyamaru, and C. Otani, “Terahertz pulsed imaging of frozen biological tissues,” Appl. Phys. Lett. 94(12), 123901 (2009).
[CrossRef]

Naftaly, M.

Nahata, A.

Nuss, M. C.

D. M. Mittleman, R. H. Jacobsen, and M. C. Nuss, “T-ray imaging,” IEEE J. Sel. Top. Quantum Electron. 2(3), 679–692 (1996).
[CrossRef]

Ogawa, Y.

Otani, C.

H. Hoshina, A. Hayashi, N. Miyoshi, F. Miyamaru, and C. Otani, “Terahertz pulsed imaging of frozen biological tissues,” Appl. Phys. Lett. 94(12), 123901 (2009).
[CrossRef]

Pande, C. M.

C. M. Pande and B. Yang, “Near-infrared spectroscopy: Applications in hair research,” J. Cosmet. Sci. 51, 183–192 (2000).

Pepper, M.

Y. C. Shen, P. F. Taday, and M. Pepper, “Elimination of scattering effects in spectral measurement of granulated materials using terahertz pulsed spectroscopy,” Appl. Phys. Lett. 92(5), 051103 (2008).
[CrossRef]

D. Crawley, C. Longbottom, V. P. Wallace, B. Cole, D. Arnone, and M. Pepper, “Three-dimensional terahertz pulse imaging of dental tissue,” J. Biomed. Opt. 8(2), 303–307 (2003).
[CrossRef] [PubMed]

Pickwell-MacPherson, E.

Y. Sun, B. M. Fischer, and E. Pickwell-MacPherson, “Effects of formalin fixing on the terahertz properties of biological tissues,” J. Biomed. Opt. 14(6), 064017 (2009).
[CrossRef] [PubMed]

Reider, G. A.

Roitberg, A.

A. G. Markelz, A. Roitberg, and E. J. Heilweil, “Pulsed terahertz spectroscopy of DNA, bovine serum albumin and collagen between 0.1 and 2.0 THz,” Chem. Phys. Lett. 320(1-2), 42–48 (2000).
[CrossRef]

Roskos, H.

Roskos, H. G.

Sawanaka, K.

Schabel, S.

Schmuttenmaer, C. A.

J. T. Kindt and C. A. Schmuttenmaer, “Far-infrared dielectric properties of polar liquids probed by femtosecond terahertz pulse spectroscopy,” J. Phys. Chem. 100(24), 10373–10379 (1996).
[CrossRef]

Shan, J.

Shen, Y. C.

Y. C. Shen, P. F. Taday, and M. Pepper, “Elimination of scattering effects in spectral measurement of granulated materials using terahertz pulsed spectroscopy,” Appl. Phys. Lett. 92(5), 051103 (2008).
[CrossRef]

Shen, Y.-C.

Y.-C. Shen and P. F. Taday, “Development and application of terahertz pulsed imaging for non destructive inspection of pharmaceutical tablet,” IEEE J. Sel. Top. Quantum Electron. 14(2), 407–415 (2008).
[CrossRef]

Y.-C. Shen, T. Lo, P. F. Taday, B. E. Cole, W. R. Tribe, and M. C. Kemp, “Detection and identification of explosives using terahertz pulsed spectroscopic imaging,” Appl. Phys. Lett. 86(24), 241116 (2005).
[CrossRef]

Siebert, K.

Stepanov, A. G.

A. G. Stepanov, J. Hebling, and J. Kuhl, “Efficient generation of subpicosecond terahertz radiation by phase-matched optical rectification using ultrashort laser pulses with tilted pulse fronts,” Appl. Phys. Lett. 83(15), 3000–3002 (2003).
[CrossRef]

Sun, Y.

Y. Sun, B. M. Fischer, and E. Pickwell-MacPherson, “Effects of formalin fixing on the terahertz properties of biological tissues,” J. Biomed. Opt. 14(6), 064017 (2009).
[CrossRef] [PubMed]

Taday, P. F.

Y.-C. Shen and P. F. Taday, “Development and application of terahertz pulsed imaging for non destructive inspection of pharmaceutical tablet,” IEEE J. Sel. Top. Quantum Electron. 14(2), 407–415 (2008).
[CrossRef]

Y. C. Shen, P. F. Taday, and M. Pepper, “Elimination of scattering effects in spectral measurement of granulated materials using terahertz pulsed spectroscopy,” Appl. Phys. Lett. 92(5), 051103 (2008).
[CrossRef]

Y.-C. Shen, T. Lo, P. F. Taday, B. E. Cole, W. R. Tribe, and M. C. Kemp, “Detection and identification of explosives using terahertz pulsed spectroscopic imaging,” Appl. Phys. Lett. 86(24), 241116 (2005).
[CrossRef]

Tani, M.

F. Miyamaru, T. Yonera, M. Tani, and M. Hangyo, “Terahertz two-dimensional electrooptic sampling using high speed complementary metal-oxide semiconductor camera,” Jpn. J. Appl. Phys. 43(No. 4A), L489–L491 (2004).
[CrossRef]

Thomson, M. D.

Tonouchi, M.

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

Tribe, W. R.

Y.-C. Shen, T. Lo, P. F. Taday, B. E. Cole, W. R. Tribe, and M. C. Kemp, “Detection and identification of explosives using terahertz pulsed spectroscopic imaging,” Appl. Phys. Lett. 86(24), 241116 (2005).
[CrossRef]

von Spiegel, W.

Wallace, V. P.

D. Crawley, C. Longbottom, V. P. Wallace, B. Cole, D. Arnone, and M. Pepper, “Three-dimensional terahertz pulse imaging of dental tissue,” J. Biomed. Opt. 8(2), 303–307 (2003).
[CrossRef] [PubMed]

Watanabe, Y.

Weling, A. S.

Yang, B.

C. M. Pande and B. Yang, “Near-infrared spectroscopy: Applications in hair research,” J. Cosmet. Sci. 51, 183–192 (2000).

Yasuda, T.

T. Yasuda, T. Yasui, T. Araki, and E. Abraham, “Real-time two-dimensional terahertz tomography of moving objects,” Opt. Commun. 267(1), 128–136 (2006).
[CrossRef]

Yasui, T.

T. Yasui, K. Sawanaka, A. Ihara, E. Abraham, M. Hashimoto, and T. Araki, “Real-time terahertz color scanner for moving objects,” Opt. Express 16(2), 1208–1221 (2008), http://www.opticsinfobase.org/abstract.cfm?URI=oe-16-2-1208 .
[CrossRef] [PubMed]

T. Yasuda, T. Yasui, T. Araki, and E. Abraham, “Real-time two-dimensional terahertz tomography of moving objects,” Opt. Commun. 267(1), 128–136 (2006).
[CrossRef]

T. Yasui and T. Araki, “Sensitive measurement of water content in dry material based on low-frequency terahertz time-domain spectroscopy,” Proc. SPIE 6024(60240A), 69–74 (2005).

Yonera, T.

F. Miyamaru, T. Yonera, M. Tani, and M. Hangyo, “Terahertz two-dimensional electrooptic sampling using high speed complementary metal-oxide semiconductor camera,” Jpn. J. Appl. Phys. 43(No. 4A), L489–L491 (2004).
[CrossRef]

Zhang, X.-C.

H. Zhong, N. Karpowicz, and X.-C. Zhang, “Terahertz emission profile from laser-induced air plasma,” Appl. Phys. Lett. 88(26), 261103 (2006).
[CrossRef]

Zhong, H.

H. Zhong, N. Karpowicz, and X.-C. Zhang, “Terahertz emission profile from laser-induced air plasma,” Appl. Phys. Lett. 88(26), 261103 (2006).
[CrossRef]

Appl. Phys. Lett.

Y.-C. Shen, T. Lo, P. F. Taday, B. E. Cole, W. R. Tribe, and M. C. Kemp, “Detection and identification of explosives using terahertz pulsed spectroscopic imaging,” Appl. Phys. Lett. 86(24), 241116 (2005).
[CrossRef]

H. Hoshina, A. Hayashi, N. Miyoshi, F. Miyamaru, and C. Otani, “Terahertz pulsed imaging of frozen biological tissues,” Appl. Phys. Lett. 94(12), 123901 (2009).
[CrossRef]

Y. C. Shen, P. F. Taday, and M. Pepper, “Elimination of scattering effects in spectral measurement of granulated materials using terahertz pulsed spectroscopy,” Appl. Phys. Lett. 92(5), 051103 (2008).
[CrossRef]

A. G. Stepanov, J. Hebling, and J. Kuhl, “Efficient generation of subpicosecond terahertz radiation by phase-matched optical rectification using ultrashort laser pulses with tilted pulse fronts,” Appl. Phys. Lett. 83(15), 3000–3002 (2003).
[CrossRef]

H. Zhong, N. Karpowicz, and X.-C. Zhang, “Terahertz emission profile from laser-induced air plasma,” Appl. Phys. Lett. 88(26), 261103 (2006).
[CrossRef]

Chem. Phys. Lett.

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Supplementary Material (3)

» Media 1: MOV (4193 KB)     
» Media 2: MOV (4036 KB)     
» Media 3: MOV (806 KB)     

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Figures (8)

Fig. 1
Fig. 1

Experimental setup. ZnTe1 and ZnTe2: zinc telluride crystals; CL1 and CL2: THz cylindrical lenses; L1: THz plano-convex lens; P: polarizer; A: analyzer; L2: plano-convex lens.

Fig. 2
Fig. 2

Spectral characteristics in the absence of a sample. (a) THz spectral line images of power and (b) power spectrum along line x (image acquisition rate = 10 line/s). Frequency dependence of (c) dynamic range and (d) signal-to-noise ratio.

Fig. 3
Fig. 3

(a) Photograph of tablet samples and sample holder concealed in a paper envelope. (b) Absorption spectra of D-glucose, D-maltose, and lactose tablets.

Fig. 4
Fig. 4

THz spectral images of transmittance in four tablet samples (Media 1). The scanned areas of the samples were 20 mm in height by 60 mm in width (image acquisition time = 60 sec). Each image consists of 232 by 600 pixels.

Fig. 5
Fig. 5

(a) Photograph of a sliced tooth sample. (b) THz spectral images of transmittance in the tooth sample (Media 2). The scanned areas of the samples were 20 mm in height by 20 mm in width (image acquisition time = 200 s). Each image consists of 232 by 200 pixels.

Fig. 6
Fig. 6

Comparison of THz transmittance spectra among six different positions in the tooth sample.

Fig. 7
Fig. 7

Temporal change of THz transmittance image in two bundles of wet (blue arrow) and dry (red arrow) hairs at 0.26 THz (Media 3). The scanned areas of the samples were 20 mm in height by 20 mm in width (image acquisition time = 200 s). Each image consists of 232 by 200 pixels.

Fig. 8
Fig. 8

Temporal change of THz power transmittance at 0.26 THz and estimated water content in a bundle of wet hairs.

Tables (1)

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Table 1 Chemical composition of four tablet samples and their THz spectral fingerprints

Equations (3)

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T ( ν ) = exp [ α ( ν ) L s a m p l e d 100 ] ,
d = 100 α ( ν ) L s a m p l e ln [ T ( ν ) ] ,
d lim ( ν ) = 100 α ( ν ) L s a m p l e ln [ 1 1 S N R ( ν ) ] .

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