Chief Scientist Laboratories Nanoscale Quantum Photonics Laboratory

Chief Scientist: Yuichiro Kato (Ph.D.)

Japanese Page

Research Summary

Control over the quantum nature of photons at the nanoscale opens up unique opportunities in quantum information processing. We study the physics underlying the operation of nanoscale photonic devices to explore new approaches for manipulating quantum states, with focus on devices that make use of individual single-walled carbon nanotubes. By combining microspectroscopy with electronic techniques, we investigate unconventional methods for manipulating the optical properties of nanomaterials within device structures, which should form the basis for future quantum technologies employing integrated quantum photonic circuits.

Main Research Fields

Interdisciplinary Science & Engineering

Related Research Fields

Mathematical & Physical Sciences
Chemistry
Engineering
nanostrucutre physics
condensed matter physics I
optical engineering, photon science

Keywords

optical properties
nanoscale physics
device physics
carbon nanotubes
photonic crystals

Selected Publications

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

1. D. Yamashita, H. Machiya, K. Otsuka, A. Ishii, Y. K. Kato.:
"Waveguide coupled cavity-enhanced light emission from individual carbon nanotubes"
APL Photonics 6, 031302 (2021).
2. 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).
3. A. Ishii, H. Machiya, Y. K. Kato.:
"High efficiency dark-to-bright exciton conversion in carbon nanotubes"
Phys. Rev. X 9, 041048 (2019).
4. K. Otsuka, A. Ishii, Y. K. Kato.:
"Super-resolution fluorescence imaging of carbon nanotubes using a nonlinear excitonic process"
Opt. Express 27, 17463 (2019).
5. 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).
6. 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).
7. 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).
8. *R. Miura, S. Imamura, R. Ohta, A. Ishii, X. Liu, T. Shimada, S. Iwamoto, Y. Arakawa, Y. K. Kato.:
"Ultralow mode-volume photonic crystal nanobeam cavities for high-efficiency coupling to individual carbon nanotube emitters"
Nature Commun. 5, 5580 (2014).
9. *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).
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).

Recent Research Results

May 25, 2021
Engineering matter at the atomic level
Mar. 6, 2020
Dark excitons can make a high contribution to light emission from nanotubes
Jul. 27, 2018
Carbon nanotubes on holey silicon make bright source of single photons

Annual research report

Lab Members

Principal investigator

Yuichiro Kato: Chief Scientist

Core members

Wataru Terashima: Research Scientist
Nan Fang: Special Postdoctoral Researcher
Chee Fai Fong: Special Postdoctoral Researcher
Keigo Otsuka: Visiting Scientist
Alka Sharma: Visiting Scientist

Contact Information

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