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Your search keyword '"Kishi, Tetsuo"' showing total 87 results
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87 results on '"Kishi, Tetsuo"'

2. Femtosecond laser direct-write photoconductive patterns on tellurite glass

Author

Torun, Gözden, Romashkina, Anastasia, Kishi, Tetsuo, and Bellouard, Yves

Subjects
Physics - Optics, Condensed Matter - Materials Science
Abstract

We report the formation of arbitrary photoconductive patterns made of tellurium (Te) nanocrystals by exposing a tellurite (TeO2-based) glass to femtosecond laser pulses. During this process, Te/TeO2-glass nanocomposite interfaces with photoconductive properties form on the tellurite glass substrate. We show that these laser-written patterns have a highly reproducible photo-response, from the near ultraviolet (263 nm) to the visible spectrum, stable over a few months. Specifically, high responsivity (16.55 A/W) and detectivity (5.25*10^11 Jones) of a single laser-written line pattern are measured for an illumination dose of 0.07 mW/cm^2 at 400 nm. This work illustrates a pathway for locally turning a tellurite glass into functional photoconductor of arbitrary shape, without adding materials and using a single laser process step., Comment: 21 pages, 5 figures

Published
2023

12. Wide-Field Polarimetric Second-Harmonic Imaging for Rapid and Nondestructive Investigation of Laser-Induced Crystallization Phenomena

Author

Lee, Seonwoo, Kishi, Tetsuo, and Bellouard, Yves

Abstract

The selective and controlled formation of nanocrystals in glass is emerging as a versatile method to achieve functional photonics, optoelectronics, and quantum devices, such as single-photon emitters. Here, we investigate the use of wide-field polarimetric second-harmonic (SH) microscopy as a method to rapidly and nondestructively examine nanoscale crystal arrangements in laser-processed glass. As a case study, we investigate tellurite glass, where the formation of a trigonal tellurium (t-Te) nanocrystalline phase after femtosecond laser exposure was recently demonstrated. Combined with theoretical models, we show that wide-field polarimetric SH microscopy offers comprehensive information on the nanocrystals’ orientation, distribution, and chirality. With its high imaging throughput and spatial resolution, this method has the potential not only to significantly accelerate investigations on laser-induced glass crystallization processes but also to provide a valuable tool for in situ process monitoring.

Published
2024
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38. Introduction to the annual S&T poster for everyone, titled “Glass – One S&T poster for Every Household” and its related activities

Author

Ono, Madoka, primary, Shinozaki, Kenji, additional, Ueda, Jumpei, additional, Oka, Ryohei, additional, Kishi, Tetsuo, additional, Kurimura, Sunao, additional, Takahashi, Yoshihiro, additional, Hasegawa, Tomoharu, additional, Matsushita, Yoshimasa, additional, Murata, Takahiro, additional, and Yamazaki, Yoshiki, additional

Published
2022
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