1. Home
  2. Research
  3. Centers & Labs
  4. RIKEN Center for Advanced Photonics

RIKEN Center for Advanced Photonics Quantum Optoelectronics Research Team

Team Leader: Yuichiro Kato (Ph.D.)

Research Summary

Yuichiro  Kato(Ph.D.)

Advances in device fabrication techniques have enabled integration of individual nanomaterials, where single electrons and single photons could be addressed. We exploit state-of-the-art nanofabrication technologies to develop and engineer optoelectronic devices with novel functionalities that can only be achieved by utilizing the quantum nature of electrons and photons at the nanoscale. We investigate devices that would allow for control over the interactions between electrons and photons at the quantum mechanical level, which would lead to quantum photon sources and optical-to-electrical quantum interfaces.

Main Research Fields

  • Interdisciplinary Science & Engineering

Related Research Fields

  • Mathematical & Physical Sciences
  • Chemistry
  • Engineering


  • optoelectronics
  • quantum devices
  • nanoscale devices
  • carbon nanotubes
  • photonic crystals

Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.

  • 1.K. Otsuka, A. Ishii, Y. K. Kato.:
    "Super-resolution fluorescence imaging of carbon nanotubes using a nonlinear excitonic process"
    Opt. Express 27, 17463 (2019).
  • 2.S. Tanaka, K. Otsuka, K. Kimura, A. Ishii, H. Imada, Y. Kim, Y. K. Kato.:
    "Organic molecular tuning of many-body interaction energies in air-suspended carbon nanotubes"
    J. Phys. Chem. C 123, 5776 (2019).
  • 3.A. Ishii, X. He, N. F. Hartmann, H. Machiya, H. Htoon, S. K. Doorn, Y. K. Kato.:
    "Enhanced single photon emission from carbon nanotube dopant states coupled to silicon microcavities"
    Nano Lett. 18, 3873 (2018).
  • 4.T. Uda, A. Ishii, Y. K. Kato.:
    "Single carbon nanotubes as ultrasmall all-optical memories"
    ACS Photonics 5, 559 (2018).
  • 5.H. Machiya, T. Uda, A. Ishii, Y. K. Kato.:
    "Spectral tuning of optical coupling between air-mode nanobeam cavities and individual carbon nanotubes"
    Appl. Phys. Lett. 112, 021101 (2018).
  • 6.A. Ishii, T. Uda, Y. K. Kato.:
    "Room-temperature single-photon emission from micrometer-long air-suspended carbon nanotubes"
    Phys. Rev. Applied 8, 054039 (2017).
  • 7.*M. Jiang, Y. Kumamoto, A. Ishii, M. Yoshida, T. Shimada, Y. K. Kato.:
    "Gate-controlled generation of optical pulse trains using individual carbon nanotubes"
    Nature Commun. 6, 6335 (2015).
  • 8.*S. Moritsubo, T. Murai, T. Shimada, Y. Murakami, S. Chiashi, S. Maruyama, Y. K. Kato.:
    "Exciton diffusion in air-suspended single-walled carbon nanotubes"
    Phys. Rev. Lett. 104, 247402 (2010).
  • 9.*Y. K. Kato, R. C. Myers, A. C. Gossard, D. D. Awschalom.:
    "Observation of the spin Hall effect in semiconductors"
    Science 306, 1910 (2004).
  • 10.*Y. Kato, R. C. Myers, A. C. Gossard, D. D. Awschalom.:
    "Coherent spin manipulation without magnetic fields in strained semiconductors"
    Nature 427, 50 (2004).

Related Links

Lab Members

Principal investigator

Yuichiro Kato
Team Leader

Core members

Akihiro Ishii
Postdoctoral Researcher
Nan Fang
Postdoctoral Researcher
Daiki Yamashita
Postdoctoral Researcher
Zhen Li
Postdoctoral Researcher
Daichi Kozawa
Special Postdoctoral Researcher

Contact Information

Main Research Building, Room 420,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Tel: +81-(0)48-462-1449
Email: katogp-info [at] ml.riken.jp