volume | PIER Journals

Abstract

A multispectral 24 x 24 bolometric matrix structure of terahertz (THz) absorbers operating at 0.3-0.4 THz was proposed and experimentally investigated. Each pixel of the structure was implemented as a fragment of an ultra-thin metamaterial absorber. The matrix structure consisted of four types of pixels with nearly perfect absorptivity. Three pixels were at 0.30, 0.33, 0.36 THz respectively with identically oriented polarization sensitivity, and the fourth pixel was at 0.33 THz oriented with polarization sensitivity orthogonal to foregoing ones. The backside of the structure included a high-performance infrared emissive layer. Resonant absorption of THz radiation induced the structure heating and increasing IR emission from the emissive layer, which was henceforth detected by the IR camera. The terahertz imaging system, capable to operate in real time, with spectral and polarization discrimination was demonstrated. The experimental results showed good spectral and polarization resolution together with acceptable spatial resolution.

1. Chang, C.-I, Hyperspectral Imaging: Techniques for Spectral Detection and Classification , Springer, 2003.

2. Chang, C.-I, Hyperspectral Data Exploitation: Theory and Applications, John Wiley & Sons, Inc., Hoboken, New Jersey, 2007.

3. Eismann, M. T., J. Kerekes, A. P. Schaum, and R. A. Leathers, "Multispectral and hyperspectral imaging: Introduction to the feature issue," Appl. Opt., Vol. 47, MHI1-MHI1, 2008.
doi:10.1364/AO.47.00MHI1

4. Adam, E., O. Mutanga, and D. Rugege, "Multispectral and hyperspectral remote sensing for identification and mapping of wetland vegetation: A review," Wetlands Ecology and Management, Vol. 18, 281-296, 2010.
doi:10.1007/s11273-009-9169-z

5. Kruse, F. A., "Identification and mapping of minerals in drill core using hyperspectral image analysis of infrared reflectance spectra," International Journal of Remote Sensing, Vol. 17, No. 9, 1623-1632, 1996.
doi:10.1080/01431169608948728

6. Govender, M., K. Chetty, and H. Bulcock, "A review of hyperspectral remote sensing and its application in vegetation and water resource studies," Water SA, Vol. 33, No. 2, 145-151, 2007.

7. Klemas, V., "Remote sensing techniques for studying coastal ecosystems: An overview," Journal of Coastal Research, Vol. 27, No. 1, 2-17, 2011.
doi:10.2112/JCOASTRES-D-10-00103.1

8. Lins, E. C., S. Pratavieira, W. T. Shigeyosi, M. Dutra-Correa, V. S. Bagnato, C. Kurachi, and L. G. Marcassa, "Assembly, calibration and application of a hyperspectral image system for biomedical imaging," WC 2009, IFMBE Proceedings 25/II, O. Dössel and W. C. Schlegel (eds.), 697-700, 2009. Available: www.springerlink.com.

9. Lee, Y.-S., Principles of Terahertz Science and Technology, Springer Science+Business Media, LLC, New York, 2009.

10. Woolard, D. L., W. J. O. Jensen, R. J. Hwu, and M. S. Shur, "Terahertz science and technology for military and security applications," Selected Topics in Electronics and Systems, Vol. 46, World Scientific Publishing Co. Pte. Ltd., Singapore, 2007.

11. Dexheimer, S. L., Terahertz Spectroscopy: Principles and Applications, CRC Press, Taylor & Francis Group, Boca Raton, FL, USA, 2008.

12. TeraView Company, Available: http://www.teraview.com.

13. Federici, J. F., B. Schulkin, F. Huang, D. Gary, R. Barat, F. Oliveira, and D. Zimdars, "THz imaging and sensing for security applications --- Explosives, weapons and drugs," Semicond. Sci. Technol., Vol. 20, S266-S280, 2005.
doi:10.1088/0268-1242/20/7/018

14. Watanabe, Y., K. Kawase, T. Ikari, H. Ito, Y. Ishikawa, and H. Minamide, "Spatial pattern separation of chemicals and frequency --- Independent components by terahertz spectroscopic imaging," Applied Optics, Vol. 42, 5744-5748, 2003.
doi:10.1364/AO.42.005744

15. Kawase, K., Y. Ogawa, and Y. Watanabe, "Component pattern analysis of chemicals using multispectral THz imaging system," Proc. SPIE, Vol. 5354, 63-70, 2004, doi:10.1117/12.528517.
doi:10.1117/12.528517

16. Han, P. Y., G. C. Cho, and X.-C. Zhang, "Time-domain transillumination of biomedical tissue with terahertz pulses," Opt. Letters, Vol. 25, 242-244, 2000.
doi:10.1364/OL.25.000242

17. Löffler, T., T. Bauer, K. J. Siebert, H. G. Roskos, A. Fitzgerald, and S. Czasch, "Terahertz dark-field imaging of biomedical tissue," Optics Express, Vol. 9, No. 12, 616-621, 2001.
doi:10.1364/OE.9.000616

18. Siebert, K., T. Löffer, H. Quast, M. Thomson, T. Bauer, R. Leonhardt, S. Czasch, and H. G. Roskos, "All-optoelectronic CW THz imaging for biomedical applications," Phys. Med. Bio., Vol. 47, No. 21, 3743-3748, 2002.
doi:10.1088/0031-9155/47/21/310

19. Woodward, R. M., B. Cole, V. P. Wallance, D. D. Arnone, R. Pye, E. H. Linfield, M. Pepper, and A. G. Davies, "Terahertz pulse imaging of in-vitro basal cell carcinoma samples," Lasers and Electro-Optics, CLEO'01, Technical Digest, Optical Society of America, Washington, DC, 329-330, 2001.

20. Arnone, D., C. Ciesla, and M. Pepper, "Terahertz imaging comes into view," Issue April 2000 of Physics World, 35-40, Institute of Physics and IOP Publishing Limited, 2000.

21. Silverberg, R. F., S. Ali, A. Bier, B. Campano, T. C. Chen, E. S. Cheng, D. A. Cottingham, T. M. Crawford, T. Downes, F. M. Finkbeiner, D. J. Fixsen, D. Logan, S. S. Meyer, C. O'Dell, T. Perera, E. H. Sharp, P. T. Timbie, and G. W. Wilson, "A bolometer array for the spectral energy distribution (SPEED) camera," Nuclear Instruments and Methods in Physics Research A, Vol. 520, 421-423, 2004.
doi:10.1016/j.nima.2003.11.350

22. Kuznetsov, S. A., A. G. Paulish, A. V. Gelfand, P. A. Lazorskiy, and V. N. Fedorinin, "Bolometric THz-to-IR converter for terahertz imaging," Applied Physics Letters, Vol. 99, 023501-3, 2011.

23. Balanis, C. A., Modern Antenna Handbook, Wiley, John Wiley & Sons, Inc., USA, 2008.

24. Liu, T. S., A. F. Starr, and W. J. Padilla, "Infrared spatial and frequency selective metamaterial with near-unity absorbance," Phys. Rev. Lett., Vol. 104, 207403-4, 2010.

25. Padilla, W. and X. Liu, "Perfect electromagnetic absorbers from microwave to optical," Optical Design & Engineering, SPIE Newsroom, 1-3, 2010, doi:10.1117/2.1201009.003137.

26. Beruete, M., M. Sorolla, R. Marques, J. D. Baena, and M. J. Freire, "Resonance and cross-polarization effects in conventional and complementary split ring resonator periodic screens ," Electromagnetics, Vol. 26, 247-260, 2006.
doi:10.1080/02726340600570328

27. Capolino, F., Theory and Phenomena of Metamaterials, Series Handbook of Artificial Materials, Vol. 1, CRC Press, Taylor and Francis Group, USA, 2009.

28. Lin, S. S., K. M. Yemelyanov, E. N. Pugh, Jr., and N. Engheta, "Separation and contrast enhancement of overlapping cast shadow components using polarization," Opt. Express, Vol. 14, No. 16, 7099-7108, 2006.
doi:10.1364/OE.14.007099

29. Lin, S. S., K. M. Yemelyanov, E. N. Pugh, Jr., and N. Engheta, "Polarization- and specular-reflection-based, non-contact latent fingerprint imaging and lifting," Journal of the Optical Society of America A, Vol. 23, No. 9, 2137-2153, 2006.
doi:10.1364/JOSAA.23.002137

30. Demos, S. G. and R. R. Alfano, "Optical polarization imaging," Appl. Opt., Vol. 36, 150-155, 1997.
doi:10.1364/AO.36.000150

31. Xuan, J., U. Klimach, H. Zhao, Q. Chen, Y. Zou, and Y. Wang, "Improved diagnostics using polarization imaging and artificial neural networks," International Journal of Biomedical Imaging, Vol. 2007, Article ID 74143, 11 Pages, 2007, doi:10.1155/2007/74143..

Dr. Sergey Alexandrovich Kuznetsov

Dr. Andrey Georgievich Paulish

Dr. Alexander Vitalievich Gelfand

Dr. Pavel Alexandrovich Lazorskiy

Dr. Victor Nikolaevich Fedorinin