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Outline

Optoelectronic devices harness the interactions between electrons and photons and are widely used in everyday applications, for example solar cells and light-emitting diodes. Continued advances in device fabrication techniques have enabled the integration of individual nanomaterials into device structures, providing opportunities to utilize the quantum nature of photons. Our research focuses on pioneering and engineering next-generation nanodevices that exploit the quantum properties of nanomaterials and enable control of light at the quantum level. By combining state-of-the-art nanofabrication and nanosynthesis techniques, we investigate devices capable of manipulating single photons in the telecommunication band as well as integrated photonics for quantum applications at room temperature.

Fields

Interdisciplinary Science and Engineering,Engineering, Physics, Chemistry

Keywords

carbon nanotubes, two-dimensional materials, photonic crystals, nanoscale devices, integrated photonics

Subjects

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

Selected Publications

1. Fang, N., Chang, Y. R., Fujii, S., Yamashita, D., Maruyama, M., Gao, Y., Fong, C. F., Kozawa D., Otsuka, K., Nagashio, K., Okada, S., Kato, Y. K.: “Room-temperature quantum emission from interface excitons in mixed-dimensional heterostructures,” Nat Commun. 15, 2871 (2024).
2. Fang, N., Chang, Y. R., Yamashita, D., Fujii, S., Maruyama, M., Gao, Y., Fong, C. F., Otsuka, K., Nagashio, K., Okada, S., Kato, Y. K.: “Resonant exciton transfer in mixed-dimensional heterostructures for overcoming dimensional restrictions in optical processes,” Nat Commun. 14, 8152 (2023).
3. 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,” Nat Commun. 13, 2814 (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” , Nat Commun. 12, 3138 (2021).
5. Ishii, A., Machiya, H., Kato, Y. K.: “High efficiency dark-to-bright exciton conversion in carbon nanotubes”, Phys. Rev. X 9, 041048 (2019).

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