Sound velocity mapping from GHz Brillouin oscillations in transparent materials by optical incidence from the side of the sample

Tomoda, Motonobu; Toda, Akira; Matsuda, Osamu; Gusev, Vitalyi E.; Wright, Oliver B.

Sound velocity mapping from GHz Brillouin oscillations in transparent materials by optical incidence from the side of the sample

Tomoda, Motonobu; Toda, Akira; Matsuda, Osamu et al.

Photoacoustics, 2023, 30, 100459

Permalink : https://hdl.handle.net/2115/88898

このアイテムのアクセス数:222件（2026-01-24 00:01 集計）

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アクセス権	metadata only access
URI	https://hdl.handle.net/2115/88898
タイトル	Sound velocity mapping from GHz Brillouin oscillations in transparent materials by optical incidence from the side of the sample
著者	Tomoda, Motonobu ; Toda, Akira ; Matsuda, Osamu ; Gusev, Vitalyi E. ; Wright, Oliver B.
e-Rad_Researcher 30344485 著者名 Tomoda, Motonobu
著者名 Toda, Akira
e-Rad_Researcher 30239024 著者名 Matsuda, Osamu
著者名 Gusev, Vitalyi E.
e-Rad_Researcher 90281790 著者名 Wright, Oliver B.
言語	英語
キーワード	Picosecond ultrasonics
	Time-domain Brillouin scattering
	Sound velocity mapping
発行日	2023-04
出版者	Elsevier
収録物名	Photoacoustics
巻(号)	30
ページ	100459
抄録	Time-domain Brillouin scattering (TDBS) is an all-optical experimental technique for investigating transparent materials based on laser picosecond ultrasonics. Its application ranges from imaging thin-films, polycrystalline materials and biological cells to physical properties such as residual stress, temperature gradients and nonlinear coherent nano-acoustic pulses. When the sample refractive index is spatially uniform and known in TDBS, analysis by windowed Fourier transforms allows one to depth-profile the sound velocity. Here, we present a new method in TDBS for extracting sound velocity without a knowledge of the refractive index, by use of probe light obliquely incident on a side face-as opposed to the usual top face-of the sample. We demonstrate this method using a fused silica sample with a titanium transducer film and map the sound velocity in the depth direction. In future, it should be possible to map the sound velocity distribution in three dimensions in inhomogeneous samples, with applications to the imaging of biological cells.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	©2023 The Author(s). Published by Elsevier GmbH. This is an open access article under the CC BY-NC-ND license(https://creativecommons.org/licenses/by-nc-nd/4.0/）
PISSN	2213-5979
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1016/j.pacs.2023.100459