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RIKEN Center for Advanced Photonics Terahertz Sensing and Imaging Research Team

Team Leader: Chiko Otani (D.Sc.)

Research Summary

Chiko  Otani

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 Fields

  • Interdisciplinary Science & 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).

Recent Research Results


Related Links

Lab Members

Principal investigator

Chiko Otani
Team Leader

Core members

Masatsugu Yamashita
Senior Scientist
Hiromichi Hoshina
Senior Scientist
Satoru Mima
Research Scientist
Yoshiaki Sasaki
Technical Scientist
Isao Yoshimine
Postdoctoral Researcher
Noriko Yaekashiwa
Contract Researcher
Shugo Oguri
Special Postdoctoral Researcher
Shota Yamazaki
Special Postdoctoral Researcher
Hisao Kawano
Technical Staff II
Kodo Kawase
Senior Visiting Scientist
Takashi Noguchi
Senior Visiting Scientist
Hiroki Kutsuma
Junior Research Associate
Xiaobo Zheng
Junior Research Associate

Contact Information

519-1399 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-0845, Japan

Email: otani [at] riken.jp