The Kato Group

We exploit state-of-the-art nanofabrication technologies to develop and engineer photonic and optoelectronic devices that utilize quantum effects, with focus on devices incorporating individual single-walled carbon nanotubes and atomically-thin layered materials.

Recent Publications

Preprints are available at arxiv.org/a/kato_y_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).
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).
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).
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).
D. Kozawa, X. Wu, A. Ishii, J. Fortner, K. Otsuka, R. Xiang, T. Inoue, S. Maruyama, Y. Wang, and Y. K. Kato Formation of organic color centers in air-suspended carbon nanotubes using vapor-phase reaction Nature Commun. 13, 2814 (2022).
H. Machiya, D. Yamashita, A. Ishii, and 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).