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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 23 — Nov. 9, 2009
  • pp: 20631–20641

Dual-frequency imaging using an electrically tunable terahertz quantum cascade laser

Paul Dean, Nor Kamila Saat, Suraj P. Khanna, Mohammed Salih, Andrew Burnett, John Cunningham, Edmund H. Linfield, and A. Giles Davies  »View Author Affiliations


Optics Express, Vol. 17, Issue 23, pp. 20631-20641 (2009)
http://dx.doi.org/10.1364/OE.17.020631


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Abstract

We report dual-frequency transmission imaging of polycrystalline materials using an electrically tunable terahertz (THz) frequency quantum cascade laser (QCL). Using our system we are able to obtain images at both 3.05 THz and 3.24 THz in a single two-dimensional scan of a sample. By taking the difference of the natural logarithms of the transmission coefficients obtained at each frequency, the difference-attenuation coefficient is determined, and evaluated for samples of lactose monohydrate, glucose monohydrate, sucrose, and the high explosive PETN. We also demonstrate difference-intensity imaging at these frequencies by combining amplitude modulation of the QCL bias with lock-in detection. Owing to the specific molecular absorption spectra of these materials in the THz frequency range, the samples can be distinguished using our technique.

© 2009 OSA

OCIS Codes
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Imaging Systems

History
Original Manuscript: August 27, 2009
Revised Manuscript: October 16, 2009
Manuscript Accepted: October 20, 2009
Published: October 26, 2009

Citation
Paul Dean, Nor Kamila Saat, Suraj P. Khanna, Mohammed Salih, Andrew Burnett, John Cunningham, Edmund H. Linfield, and A. Giles Davies, "Dual-frequency imaging using an electrically tunable terahertz quantum cascade laser," Opt. Express 17, 20631-20641 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-23-20631


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References

  1. B. B. Hu and M. C. Nuss, “Imaging with terahertz waves,” Opt. Lett. 20(16), 1716–1718 (1995). [CrossRef] [PubMed]
  2. V. P. Wallace, A. J. Fitzgerald, S. Shankar, N. Flanagan, R. J. Pye, J. Cluff, and D. D. Arnone, “Terahertz pulsed imaging of basal cell carcinoma ex vivo and in vivo,” Br. J. Dermatol. 151(2), 424–432 (2004). [CrossRef] [PubMed]
  3. S. M. Kim, F. Hatami, J. S. Harris, A. W. Kurian, J. Ford, D. King, G. Scalari, M. Giovannini, N. Hoyler, J. Faist, and G. Harris, “Biomedical terahertz imaging with a quantum cascade laser,” Appl. Phys. Lett. 88(15), 153903–153905 (2006). [CrossRef]
  4. D. J. Cook, B. K. Decker, G. Dadusc, and M. G. Allen, “Through container THz sensing: applications for bio detection,” Proc. SPIE Int. Soc. Opt. Eng. 5268, 36–42 (2004).
  5. 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/abstract.cfm?URI=oe-11-20-2549 . [CrossRef] [PubMed]
  6. M. Lu, J. Shen, N. Li, Y. Zhang, C. Zhang, L. Liang, and X. Xu, “Detection and identification of illicit drugs using terahertz imaging,” J. Appl. Phys. 100(10), 103104–103106 (2006). [CrossRef]
  7. Y. C. Shen, T. Lo, P. F. Taday, B. E. Cole, R. Tribe, and M. C. Kemp, “Detection and identification of explosives using terahertz pulsed spectroscopic imaging,” Appl. Phys. Lett. 86(24), 241116–241118 (2005). [CrossRef]
  8. N. Karpowicz, H. Zhong, C. Zhang, K. Lin, J. Hwang, J. Xu, and X.-C. Zhang, “Compact continuous-wave subterahertz system for inspection applications,” Appl. Phys. Lett. 86(5), 054105–054107 (2005). [CrossRef]
  9. N. Karpowicz, H. Zhong, J. Xu, K. Lin, J. S. Hwang, and X.-C. Zhang, “Comparison between pulsed terahertz time-domain imaging and continuous wave terahertz imaging,” Semicond. Sci. Technol. 20(7), S293–S299 (2005). [CrossRef]
  10. H. Zhong, A. Redo-Sanchez, and X.-C. Zhang, “Identification and classification of chemicals using terahertz reflective spectroscopic focal-plane imaging system,” Opt. Express 14(20), 9130–9141 (2006), http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-20-9130 . [CrossRef] [PubMed]
  11. Y. Watanabe, K. Kawase, T. Ikari, H. Ito, Y. Ishikawa, and H. Minamide, “Component spatial pattern analysis of chemicals using terahertz spectroscopic imaging,” Appl. Phys. Lett. 83(4), 800–802 (2003). [CrossRef]
  12. A. Dobroiu, M. Yamashita, Y. N. Ohshima, Y. Morita, C. Otani, and K. Kawase, “Terahertz imaging system based on a backward-wave oscillator,” Appl. Opt. 43(30), 5637–5646 (2004). [CrossRef] [PubMed]
  13. S. Mair, B. Gompf, and M. Dressel, “Microspectroscopy and imaging in the THz range using coherent CW radiation,” Phys. Med. Biol. 47(21), 3719–3725 (2002). [CrossRef] [PubMed]
  14. T. Kleine-Ostmann, P. Knobloch, M. Koch, S. Hoffmann, M. Breede, M. Hofmann, G. Hein, K. Pierz, M. Sperling, and K. Donhuijsen, “Continuous-wave THz imaging,” Electron. Lett. 37(24), 1461–1462 (2001). [CrossRef]
  15. R. Köhler, A. Tredicucci, F. Beltram, H. E. Beere, E. H. Linfield, A. G. Davies, D. A. Ritchie, R. C. Iotti, and F. Rossi, “Terahertz semiconductor-heterostructure laser,” Nature 417(6885), 156–159 (2002). [CrossRef] [PubMed]
  16. C. Walther, M. Fischer, G. Scalari, R. Terazzi, N. Hoyler, and J. Faist, “Quantum cascade lasers operating from 1.2 to 1.6 THz,” Appl. Phys. Lett. 91(13), 131122 (2007). [CrossRef]
  17. A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “Real-time terahertz imaging over a standoff distance (>25 meters),” Appl. Phys. Lett. 89(14), 141125–141127 (2006). [CrossRef]
  18. S. Kumar, Q. Hu, and J. L. Reno, “186 K operation of terahertz quantum-cascade lasers based on a diagonal design,” Appl. Phys. Lett. 94(13), 131105–131107 (2009). [CrossRef]
  19. B. Williams, S. Kumar, Q. Hu, and J. L. Reno, “High-power terahertz quantum-cascade lasers,” Electron. Lett. 42(2), 89–90 (2006). [CrossRef]
  20. P. Dean, M. U. Shaukat, S. P. Khanna, S. Chakraborty, M. Lachab, A. Burnett, G. Davies, and E. H. Linfield, “Absorption-sensitive diffuse reflection imaging of concealed powders using a terahertz quantum cascade laser,” Opt. Express 16(9), 5997–6007 (2008), http://www.opticsinfobase.org/oe/abstract.cfm?uri=OE-16-9-5997 . [CrossRef] [PubMed]
  21. A. W. M. Lee, B. S. Wil, S. Kumar, Qing Hu, and J. L. Reno, “Real-time imaging using a 4.3-THz quantum cascade laser and a 320 x 240 microbolometer focal-plane array,” IEEE Photon. Technol. Lett. 18(13), 1415–1417 (2006). [CrossRef]
  22. H. Luo, S. R. Laframboise, Z. R. Wasilewski, G. C. Aers, H. C. Liu, and J. C. Cao, “Terahertz quantum-cascade lasers based on a three-well active module,” Appl. Phys. Lett. 90(4), 041112 (2007). [CrossRef]
  23. M. A. Belkin, J. A. Fan, S. Hormoz, F. Capasso, S. P. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Terahertz quantum cascade lasers with copper metal-metal waveguides operating up to 178 K,” Opt. Express 16(5), 3242–3248 (2008), http://www.opticsinfobase.org/abstract.cfm?URI=oe-16-5-3242 . [CrossRef] [PubMed]
  24. S. P. Khanna, M. Salih, P. Dean, A. G. Davies, and E. H. Linfield, “Electrically tunable terahertz quantum cascade laser with a heterogeneous active region,” Appl. Phys. Lett. in press.
  25. A. Burnett, W. Fan, P. Upadhya, J. Cunningham, E. H. Linfield, A. G. Davies, H. Edwards, T. Munshi, and A. O’Neil, “Analysis of drugs of abuse and explosives using terahertz time-domain and Raman spectroscopy,” Proc. SPIE Int. Soc. Opt. Eng. 6549, 61200 (2007).
  26. J. Chen, Y. Chen, H. Zhao, G. J. Bastiaans, and X.-C. Zhang, “Absorption coefficients of selected explosives and related compounds in the range of 0.1-2.8 THz,” Opt. Express 15(19), 12060–12067 (2007), http://www.opticsinfobase.org/abstract.cfm?URI=oe-15-19-12060 . [CrossRef] [PubMed]
  27. Y. C. Shen, P. F. Taday, and M. Pepper, “Elimination of scattering effects in soectral measurement of granulated materials using terahertz pulsed spectroscopy,” Appl. Phys. Lett. 92(5), 051103–051105 (2008). [CrossRef]
  28. M. Franz, B. M. Fischer, and M. Walther, “The Christiansen effect in terahertz time-domain spectra of coarse-grained powders,” Appl. Phys. Lett. 92(2), 021107 (2008). [CrossRef]
  29. C. V. Raman, “The theory of the Christiansen experiment,” Proc. Indian. Acad. Sci, Sect. A 29, 381–389 (1949).
  30. J. R. Fletcher, G. P. Swift, D. C. Dai, J. A. Levitt, and J. M. Chamberlain, “Propagation of terahertz radiation through random structures: An alternative theoretical approach and experimental validation,” J. Appl. Phys. 101(1), 013102 (2007). [CrossRef]

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