Terahertz-wave Research Group

Group Director

Katsumi Midorikawa

  • D.Eng.
  • Katsumi Midorikawa
  • Brief resume
    1983
    Ph.D., Electrical Engineering, Keio University
    1983
    Research Scientist, Laser Science Research Group, RIKEN
    1997
    Chief Scientist, Laser Technology Laboratory, RIKEN (-current)
    2005
    Head, Extreme Phonics Research Group, RIKEN
    2005
    Director, Terahertz Research Program, RIKEN
    2008
    Director, Extreme Photonics Department, RIKEN (-current)
    2008
    Group Head, Extreme Photonics Research Group, RIKEN (-current)

Outline

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 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 waves and the characteristic absorption features 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 waves through the development of newer and better detection systems, using these for the development of practical technology for their use, and linking them both organically and strategically to create standard criteria for terahertz light technology.

Selected Publications

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

Core Members

Principal Investigator add delete
Katsumi Midorikawa Group Director (Group Director, Extreme Photonics Research Group)    
Staff Scientist add delete
Postdoctoral Fellow add delete
Student Trainee add delete
Technical Assistant add delete
Administrative Assistant add delete
Visiting Research Staff add delete
Other Staff add delete

( ) indicates primary affiliation in RIKEN. Please see Research Team page for other members.

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