Terahertz-wave Research Group
Group Director
Katsumi MIDORIKAWA (D.Eng.)
Because of the difficulty heretofore experienced in detecting, not to mention generating, terahertz light, it has been considered by many in scientific and industrial research to be the last frontier in the study of electromagnetic waves and thus remained largely unexplored. In recent years, however, such developments as tunable light sources utilizing pumping solid state lasers and spectroscopy using femtosecond lasers have brought about a great deal of progress in technological development, resulting in various proposals for applications utilizing unique transmission properties of terahertz wave and the characteristic absorption feature of chemical substances ("fingerprints"), and basic research into this field has begun. In this project, we aim to develop the field through the establishment of basic techniques for greater sophistication in the use of terahertz wave through the development of newer and better detection systems, using these for the development of practical technology for their use, linking these both organically and strategically to create standard criteria for terahertz light technology.
- Ultra-wide-band tunable terahertz sources
- Terahertz detectors and imaging technology
- Terahertz quantum cascade lasers
- Minamide, H., Zhang J., Guo R., Miyamoto K. Ohono S., and Ito, H.:
"High-sensitivity detection of terahertz wave using nonlinear up-conversion in an organic 4-dimethylamino-N-methyl-4-stilbazolium tosylate crystal"
Appl. Phys. Lett. 97, 121106 (2010). - Tang M., Minamide H., Wang Y., Notake T., Ohno S., and Ito H.:
"Dual-wavelength single-crystal double-pass KTP optical parametric oscillator and its application in terahertz wave generation"
Opt. Lett. 35, 1698 (2010). - Hoshina, H., Morisawa Y., Sato H., Kamiya A., Noda I., Ozaki Y., and Otani, C.:
"Higher order conformation of poly(3- hydroxyalkanoate)s studied by terahertz time-domain spectroscopy"
Appl. Phys. Lett. 96, 101904 (2010) - Yamashita M., Otani C., Kawase K., Matsumoto T., Nikawa K., Kim S. M. , Murakami H., and Tonouchi M.:
"Backside observation of large-scale integrated circuits with multilayered interconnections using laser terahertz emission microscope"
Appl. Phys. Lett. 94, 191104 (2009). - Terashima, W. and Hirayama, H.:
"The Utility of Droplet Elimination by Thermal Annealing Technique for Fabrication of GaN/AlGaN Terahertz Quantum Cascade Structure by Radio Frequency Molecular Beam Epitaxy"
Appl. Phys. Exp. 3, 125501 (2010) - Terashima, W. and Hirayama, H.:
"Spontaneous emission from GaN/AlGaN terahertz quantum cascade laser grown on GaN substrate"
Phys. Status Solidi. (accepted for publication in 2011)