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Terahertz-wave Research Group
Katsumi MIDORIKAWA
Group Director
Katsumi MIDORIKAWA (D.Eng.)
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Research Areas

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.

Research Subject

  1. Ultra-wide-band tunable terahertz sources
  2. Terahertz detectors and imaging technology
  3. Terahertz quantum cascade lasers

Related links

  1. RIKEN Advanced Science Institute Website_Laboratories PageNew Window
  2. Individual Website Laboratory PageNew Window

List of Selected Publications

  1. Wang, Y.Y., Notake, T., Tang, M., Nawata, K., Ito, H., and Minamide, H.:
    "Terahertz-wave water concentration and distribution measurement in thin biotissue based on a novel sample preparation"
    Phys. Med. Biol., 56, 4517-4527 (2011).
  2. Notake, T., Nawata, K., Kawamata, H., Matsukawa, T., and Minamide, H.:
    "Solution growth of high-quality organic N-benzyl-2-methyl-4-nitroaniline crystal for ultra-wideband tunable DFG-THz source"
    Opt. Mater. Express, 2(2), 119-125 (2012).
  3. Hayashi, S., Nawata, K., Sakai, H., Taira, T., Minamide, H., and Kawase, K.:
    "High-power, single-longitudinal-mode terahertz-wave generation pumped by a microchip Nd:YAG laser"
    Opt. Express, 20(3), 2881-2886 (2012).
  4. Hoshina, H., Ishii, S., Morisawa, Y., Sato, H., Ozaki, Y., and Otani, C.:
    "Isothermal Crystallization of Poly(3-hydroxybutyrate) Studied by Terahertz Two-dimensional Correlation Spectroscopy"
    Appl. Phys. Lett. 100, 011907 (2012).
  5. Yamashita, M., Otani, C., Shimizu, M., and Okuzaki, H.:
    "Effect of solvent on carrier transport in poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) studied by terahertz and infrared-ultraviolet spectrosopy"
    Appl. Phys. Lett., 99(14), 143307 (2011).
  6. Hoshina, H., Morisawa, Y., Sato, H., Minamide, H., Noda, I., Ozaki, Y., and Otani, C.:
    "Polarization and temperature dependent spectra of poly(3-hydroxyalkanoate)s measured at terahertz frequencies"
    Phys. Chem. Chem. Phys., 13 (20), 9173 - 9179 (2011).
  7. Lin, T., Ying , L., and Hirayama, H.:
    "Threshold Current density Reduction by Utilizing High-Al-Composition Barriers in 3.7 THz GaAs/AlGaAs Quantum Cascade Lasers"
    Appl. Phys. Express, 5, 012101 (2011).
  8. Fujikawa, S., and Hirayama, H.:
    "284-300 nm Quaternary InAlGaN-based Deep-Ultraviolet Light-Emitting Diodes on Si(111) Substrates"
    Appl. Phys. Express, 4, 061002 (2011).
  9. Terashima, W., and Hirayama, H.:
    "Molecular beam epitaxy growth of GaN/AlGaN quantum cascade structure using droplets elimination by thermal annealing technique"
    Phys. Status Solidi A, 208(5), 1187-1190 (2011).

Members

Principal Investigator

Katsumi MIDORIKAWA
Group Director




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