RIKEN Center for Advanced Photonics Quantum Optoelectronics Research Team

Team Director: Yuichiro Kato (Ph.D.)

Japanese Page

Research Summary

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
optical engineering and photon science
nanostrucutre physics

Keywords

optoelectronics
quantum devices
nanoscale devices
carbon nanotubes
photonic crystals

Selected Publications

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

1. N. Fang, Y. R. Chang, S. Fujii, D. Yamashita, M. Maruyama, Y. Gao, C. F. Fong, D. Kozawa, K. Otsuka, K. Nagashio, S. Okada, Y. K. Kato:
"Room-temperature quantum emission from interface excitons in mixed-dimensional heterostructures"
Nature Commun. 15, 2871 (2024).
2. S. Fujii, N. Fang, D. Yamashita, D. Kozawa, C. F. Fong, Y. K. Kato:
"van der Waals decoration of ultra-high-Q silica microcavities for χ(2)-χ(3) hybrid nonlinear photonics"
Nano Lett. 24, 4209 (2024).
3. N. Fang, Y. R. Chang, D. Yamashita, S. Fujii, M. Maruyama, Y. Gao, C. F. Fong, K. Otsuka, K. Nagashio, S. Okada, Y. K. Kato:
"Resonant exciton transfer in mixed-dimensional heterostructures for overcoming dimensional restrictions in optical processes"
Nature Commun. 14, 8152 (2023).
4. N. Fang, D. Yamashita, S. Fujii, K. Otsuka, T. Taniguchi, K. Watanabe, K. Nagashio, Y. K. Kato:
"Quantization of mode shifts in nanocavities integrated with atomically thin sheets"
Adv. Opt. Mater. 10, 2200538 (2022).
5. D. Kozawa, X. Wu, A. Ishii, J. Fortner, K. Otsuka, R. Xiang, T. Inoue, S. Maruyama, Y. Wang, Y. K. Kato:
"Formation of organic color centers in air-suspended carbon nanotubes using vapor-phase reaction"
Nature Commun. 13, 2814 (2022).
6. H. Machiya, D. Yamashita, A. Ishii, Y. K. Kato:
"Evidence for near-unity radiative quantum efficiency of bright excitons in carbon nanotubes from the Purcell effect"
Phys. Rev. Research 4, L022011 (2022).
7. Z. Li, K. Otsuka, D. Yamashita, D. Kozawa, Y. K. Kato:
"Quantum emission assisted by energy landscape modification in pentacene-decorated carbon nanotubes"
ACS Photonics 8, 2367 (2021).
8. K. Otsuka, N. Fang, D. Yamashita, T. Taniguchi, K. Watanabe, Y. K. Kato:
"Deterministic transfer of optical-quality carbon nanotubes for atomically defined technology"
Nature Commun. 12, 3138 (2021).
9. A. Ishii, H. Machiya, Y. K. Kato:
"High efficiency dark-to-bright exciton conversion in carbon nanotubes"
Phys. Rev. X 9, 041048 (2019).
10. *Y. K. Kato, R. C. Myers, A. C. Gossard, D. D. Awschalom:
"Observation of the spin Hall effect in semiconductors"
Science 306, 1910 (2004).