Terahertz Application Team
Research Areas
After more than a dozen years of basic research into the submillimeter and far infrared range, Terahertz wave research has finally come into its own, and is recognized by the world scientific community as a new frontier. The terahertz wave exhibits properties of both sides of the electromagnetic spectrum. Like radio wave, it can be transmitted through a wide variety of substances such as paper, cloth, ceramics, plastics, wood, various powders, dried food, and so on. In addition, like light wave, it can easily be propagated through space, reflected, focused and refracted using terahertz optics. Furthermore, the short wavelength (several hundred μm), much shorter than that of usual radio waves, allows for a spatial resolution which is sufficient in many imaging applications. The range of potential applications is likely to expand even further with the increased availability of many absorption spectra (i.e., fingerprint spectra) peculiar to specific chemicals, including vitamins, sugars, pharmaceuticals, agricultural chemicals, discovered in the terahertz wave region. In our research team, we are studying several novel steps toward real-life applications of terahertz wave. For details, please see below.
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List of Selected Publications
| (1) | Hayashi, S., Maki, K., Otani, C., and Kawase, K.: "TERAHERTZ WAVE PARAMETRIC SOURCES." Topical problems of Nonlinear wave physics, Proc. SPIE, Vol. 5975, pp. 219 (2006) |
| (2) | Hayashi, S., Minamide, H., Ikari, T., Ogawa, Y., Shikata, J.-i., Ito, H., Otani, C., and Kawase, K.: "Output power enhancement of a palmtop terahertz-wave parametric generator." Appl. Opt., Vol. 46, pp. 117 (2007) |
| (3) | Yoshida, H., Ogawa, Y., Kawai, Y., Hayashi, S., Hayashi, A., Otani, C., Kato, E., Miyamaru, F., and Kawase, K.: "Terahertz sensing method for protein detection using a thin metallic mesh." Appl. Phys. Lett., Vol. 91, no. 25, pp. 253901 (2007) |
| (4) | Shibuya, T., Akiba, T., Suizu, K., Uchida, H., Otani, C., and Kawase, K.: "Terahertz-Wave Generation Using a 4-Dimethylamino-N-methyl-4-stilbazolium tosylate Crystal Under Intra-Cavity Conditions." Appl. Phys. Exp., vol. 1, pp.042002 (2008) |
| (5) | Cheng, L., Hayashi, S., Otani, C., Kawase, K., Miyazawa, T., and Ogawa, Y.: "Terahertz-wave absorption in liquids measured using the evanescent field of a silicon waveguide." Appl. Phys. Lett., Vol. 92, pp. 181104 (2008) |
| (6) | Kawase, K., Dobroiu, A., Yamashita, M., Sasaki, Y., and Otani, C.: "THz rays to detect drugs of abuse, Terahertz Frequency Detection and Identification of Materials and Objects, Edited by R.E. Miles, X.-C. Zhang, H. Eisele, A. Krotkus." NATO Science for Peace and Security Series B: Physics and Biophysics, pp. 241 (Springer, 2007) |
| (7) | Suizu, K. and Kawase, K.: "Monochromatic-tunable terahertz-wave sources based on nonlinear frequency conversion using lithium niobate crystal." IEEE J. Selected Topics in Quantum Electronics, vol. 14, No. 2, pp. 295 (2008) |
| (8) | Yoshida, S., Kato, E., Suizu, K., Nakagomi, Y., Ogawa, Y., and Kawase, K.: "Terahertz Sensing of Thin Poly(ethylene Terephthalate) Film Thickness Using a Metallic Mesh." Appl. Phys. Express, vol. 2, 012301-1 (2009) |
| (9) | Ogawa, Y., Hayashi, S., Oikawa, M., Otani, C., and Kawase, K.: "Interference terahertz label-free imaging for protein detection on a membrane." Opt. Exp., vol. 16, No. 26, pp. 22083 (2008) |