RIKEN Center for Advanced Photonics Quantum Optoelectronics Research Team

Team Leader: 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, 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).
2.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).
3.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).
4.C. F. Fong, Y. Ota, Y. Arakawa, S. Iwamoto, Y. K. Kato:
"Chiral modes near exceptional points in symmetry broken H1 photonic crystal cavities"
Phys. Rev. Research 3, 043096 (2021).
5.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).
6.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).
7.N. Fang, K. Otsuka, A. Ishii, T. Taniguchi, K. Watanabe, K. Nagashio, Y. K. Kato:
"Hexagonal boron nitride as an ideal substrate for carbon nanotube photonics"
ACS Photonics 7, 1773 (2020).
8.A. Ishii, H. Machiya, Y. K. Kato:
"High efficiency dark-to-bright exciton conversion in carbon nanotubes"
Phys. Rev. X 9, 041048 (2019).
9.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).
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).