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Time-domain Brillouin scattering assisted by diffraction gratings

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タイトル: Time-domain Brillouin scattering assisted by diffraction gratings
著者: Matsuda, Osamu 著作を一覧する
Pezeril, Thomas 著作を一覧する
Chaban, Ievgeniia 著作を一覧する
Fujita, Kentaro 著作を一覧する
Gusev, Vitalyi 著作を一覧する
発行日: 2018年 2月 5日
出版者: American Physical Society (APS)
誌名: Physical Review B
巻: 97
号: 6
開始ページ: 064301
出版社 DOI: 10.1103/PhysRevB.97.064301
抄録: Absorption of ultrashort laser pulses in a metallic grating deposited on a transparent sample launches coherent compression/dilatation acoustic pulses in directions of different orders of acoustic diffraction. Their propagation is detected by delayed laser pulses, which are also diffracted by the metallic grating, through the measurement of the transient intensity change of the first-order diffracted light. The obtained data contain multiple frequency components, which are interpreted by considering all possible angles for the Brillouin scattering of light achieved through multiplexing of the propagation directions of light and coherent sound by the metallic grating. The emitted acoustic field can be equivalently presented as a superposition of plane inhomogeneous acoustic waves, which constitute an acoustic diffraction grating for the probe light. Thus the obtained results can also be interpreted as a consequence of probe light diffraction by both metallic and acoustic gratings. The realized scheme of time-domain Brillouin scattering with metallic gratings operating in reflection mode provides access to wide range of acoustic frequencies from minimal to maximal possible values in a single experimental optical configuration for the directions of probe light incidence and scattered light detection. This is achieved by monitoring the backward and forward Brillouin scattering processes in parallel. Potential applications include measurements of the acoustic dispersion, simultaneous determination of sound velocity and optical refractive index, and evaluation of samples with a single direction of possible optical access.
Rights: ©2018 American Physical Society
資料タイプ: article
URI: http://hdl.handle.net/2115/68491
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 松田 理

 

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