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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. De Miguel J., and Otani C.:
    "Superdense beaming of axion dark matter in the vicinity of the light cylinder of pulsars"
    J. Cosmol. Astropart. Phys. 8, 026 (2022).
  • 2. Feng C. H., Otani C., and Ogawa Y.:
    "Innovatively identifying naringin and hesperidin by using terahertz spectroscopy and evaluating flavonoids extracts from waste orange peels by coupling with multivariate analysis"
    Food Control. 137, 108897, pp.1-6 (2022).
  • 3. Ikeda S., Yamashita M., and Otani C.:
    "Hot carrier dynamics and electron-phonon coupling in photoexcited graphene via time-resolved ultrabroadband terahertz spectroscopy"
    Phys. Rev. Research. 3, 043143 (2021).
  • 4. Yamashita M., and Otani C.:
    "Intrinsic and extrinsic effects on intraband optical conductivity of hot carriers in photoexcited graphene"
    Phys. Rev. Research. 3, 013150 (2021).
  • 5. [Review] Feng C. H., and Otani C.:
    "Terahertz spectroscopy technology as an innovative technique for food: Current state-of-the-art research advances"
    Crit. Rev. Food Sci. Nutr. 61, 2523 (2021).
  • 6. Yamazaki S., Ueno Y., Hosoki R., Saito T., Idehara T., Yamaguchi Y., Otani C., Ogawa Y., Harata M., and Hoshina H.:
    "THz irradiation inhibits cell division by affecting actin dynamics"
    PloS One. 16, e0248381 (2021).
  • 7. Momiyama H., Sasaki Y., Yoshimine I., Nagano S., Yuasa T., and Otani C.:
    "Depth super-resolved imaging of infrastructures defects using a terahertz-wave interferometer"
    NDT&E Int’l. 120, 102431 (2021).
  • 8. Yamazaki S., Harata M., Ueno Y., Tsubouchi M., Konagaya K., Ogawa Y., Isoyama G., Otani C., and Hoshina H.:
    "Propagation of THz irradiation energy through aqueous layers: Demolition of actin filaments in living cells"
    Scientific Reports. 10, 9008 (2020).
  • 9. Hoshina H., Saito Y., Furuhashi T., Shimazaki T., Sawada M., Hioki Y., and Otani C.:
    "Terahertz Spectroscopy for Characterization of Hydrogen Bonding and Cross-linked Structure Dynamics in Polyurethane"
    J. Infra. Milli. TeraHz. Waves. 41, 265-275, (2020).
  • 10. Suzuki H., Ishida M., Otani C., Kawachi K., Kasama Y., Won E., Miyazaki Y., and Nakano M.:
    "The thermodynamics properties and molecular dynamics of [Li+@C60](PF6-) associated with structural phase transitions"
    Phys. Chem. Chem. Phys. 21, 16147 (2019).

Recent Research Results

Related Links

Lab Members

Principal investigator

Chiko Otani
Team Leader

Core members

Hiromichi Hoshina
Senior Scientist
Yuto Kamei
Postdoctoral Researcher
Shusaku Nakajima
Postdoctoral Researcher
Javier Miguel Hernandez
Special Postdoctoral Researcher
Kodo Kawase
Senior Visiting Scientist
Yukihiro Ozaki
Senior Visiting Scientist
Tomokazu Iyoda
Senior Visiting Scientist
Masayoshi Tonouchi
Senior Visiting Scientist
Yuya Ueno
Junior Research Associate
Mingxi Chen
Junior Research Associate
Ryota Ito
Junior Research Associate

Contact Information

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

Email: otani [at] riken.jp