Quantum Optoelectronics Research Team

Team Leader

Yuichiro Kato


Photo: Yuichiro Kato


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Quantum Optoelectronics Research Team,
RIKEN Center for Advanced Photonics

2-1 Hirosawa, Wako, Saitama 351-0198 Japan


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.


Engineering, Physics, Chemistry, Interdisciplinary Science and Engineering


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


  1. Room-temperature telecommunication-wavelength single photon source
  2. Electroluminescence devices with extremely low energy dissipation
  3. Optical sensors with novel functionalities
Research image

Scanning electron micrograph of a suspended carbon nanotube field effect transistor

Selected Publications

  1. Fang, N., Yamashita, D., Fujii, S., Otsuka, K., Taniguchi, T., Watanabe, K., Nagashio, K., Kato, Y. K.: “Quantization of mode shifts in nanocavities integrated with atomically thin sheets,” Adv. Opt. Mater. 10, 2200538 (2022).
  2. Kozawa, D., Wu, X., Ishii, A., Fortner, J., Otsuka, K., Xiang, R., Inoue, T., Maruyama, S., Wang, Y-H., Kato, Y. K.: “Formation of organic color centers in air-suspended carbon nanotubes using vapor-phase reaction,” Nature Commun. 13, 2814 (2022).
  3. Machiya, H., Yamashita, D., Ishii, A., Kato, Y. K.: “Evidence for near-unity radiative quantum efficiency of bright excitons in carbon nanotubes from the Purcell effect,” Phys. Rev. Research 4, L022011 (2022).
  4. Otsuka, K., Fang, N., Yamashita, D., Taniguchi, T., Watanabe, K., and Kato, Y. K.: “Deterministic transfer of optical-quality carbon nanotubes for atomically defined technology” , Nature Commun. 12, 3138 (2021).
  5. Ishii, A., Machiya, H., and Kato, Y. K.: “High efficiency dark-to-bright exciton conversion in carbon nanotubes” , Phys. Rev. X 9, 041048 (2019).


Yuichiro KatoTeam Leader
Mengyue WangPostdoctoral Researcher
Shun FujiiVisiting Researcher
Daichi KozawaVisiting Researcher
Daiki YamashitaVisiting Researcher