Centers & Labs

RIKEN Center for Advanced Photonics

Terahertz Sensing and Imaging Research Team

Team Leader: Chiko Otani (D.Sci.)
Chiko  Otani(D.Sci.)

Terahertz (THz) wave has the unique characteristics such as the transparency to many soft materials and their spectral absorption features. These characteristics can be utilized for many applications in various scientific and industrial fields. In this team, we are developing novel technology, science and applications in THz sensing and imaging. Especially, we have promoted the development of ultra-broadband spectroscopic ellipsometry and optical-pump THz-probe systems and high-sensitivity imaging detectors, the research of THz spectroscopy of polymers as well as the challenge to the control of molecular structures and functions by the strong THz fields.

Main Research Field

Interdisciplinary science and engineering

Related Research Fields

Chemistry / Engineering


  • Terahertz science
  • Terahertz spectroscopy
  • Terahertz imaging
  • Terahertz control of matter
  • Superconducting detector

Selected Publications

  1. Hoshina H., Suzuki H., Otani C., Nagai M., Kawase K., Irizawa A., Isoyama G.:
    "Polymer Morphological Change Induced by Terahertz Irradiation"
    Scientific Reports, 6, 27180, (2016).
  2. Suzuki H., Ishida M., Yamashita M., Otani C., Kawachi K., Kasama Y., Kwon E.:
    "Rotational Dynamics of Li+ Ions Encapsulated in C60 Cages at Low Temperatures"
    Phys. Chem. Chem. Phys. (Commu.), vol. 18, pp. 31384-31387, (2016).
  3. Suzuki H., Otani C., Yoshinari N., Konno T.:
    "A terahertz absorption spectroscopy study of structural changes in D-penicillaminato CuI8CuII6 clusters induced by water desorption,"
    Inorganic Chemistrry Frontier, vol. 3, Page 274-278, (2016).
  4. Suzuki H., Ishii S., Otani C., Hoshina H.:
    "Low-frequency vibrations of polyamide-6 as a function of temperature and thermal history investigated by terahertz absorption spectroscopy,"
    Euro. Polym. J. vol. 67, pp. 284–291 (2015).
  5. [Invited paper] Karatsu K., Mima S., Oguri S., Naruse M., Nitta T., Sekine M., Sekiguchi S., Okada T., Shu S., Sekimoto Y., Kiuchi H., Dominjon A., Takahashi K., Koga K., Otani C., Furukawa N., Tajima O., Watanabe H., Yoshida M., Kibe Y., Ishino H., Kibayashi A.:
    "Development of microwave kinetic inductance detector for cosmological observations,"
    IEICE Trans. Electronics, vol. E98-C, pp. 207-218 (2015).
  6. Tapsanit P., Yamashita M., Otani C.:
    "Analytical solutions of electromagnetic waves in focusing and magnifying cylindrical hyperlenses: Green’s function approach,"
    Opt. Express, 22, pp. 229-238 (2014).
  7. Suzuki H., Hoshina H., Otani C.:
    "Kinetics of polymorphic transitions of cyclohexanol investigated by terahertz spectroscopy,"
    Crystal Growth and Design, vol. 14, pp. 4087−4093 (2014).
  8. Hoshina H., Ozaki A., Itagaki Y., Yajima S., Suzuki H., Ishii S., Ishida M., Uchiyama T., Kimura K., Otani C.:
    "Sol–gel transition of organogels observed by terahertz spectroscopy,"
    Chem. Phys. Lett., vol. 608, pp. 173-176 (2014).
  9. Yamashita M., Takahashi H., Ouchi T., Otani C.:
    "Ultra-broadband terahertz time-domain ellipsometric spectroscopy utilizing GaP and GaSe emitters and an epitaxial layer transferred photoconductive detector,"
    Appl. Phys. Lett., vol. 104, 051103 (2014).
  10. Suga M., Sasaki Y., Sasahara T., Yuasa T., Otani C.:
    "THz phase-contrast computed tomography based on Mach-Zehnder interferometer using continuous wave source: proof of the concept,"
    Opt. Express, 21, 25389 (2013).

Lab Members

Principal Investigator

Chiko Otani
Team Leader

Core Members

Masatsugu Yamashita
Senior Scientist
Hiromichi Hoshina
Senior Scientist
Yoshiaki Sasaki
Technical Scientist
Satoru Mima
Postdoctoral Researcher
Kenji Kiuchi
Postdoctoral Researcher
Noriko Yaekashiwa
Contract Researcher
Kodo Kawase
Senior Visiting Scientist
Sho Ikeda
Junior Research Associate