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Optical generation and detection of gigahertz shear acoustic waves in solids assisted by a metallic diffraction grating
| Title: | Optical generation and detection of gigahertz shear acoustic waves in solids assisted by a metallic diffraction grating |
| Authors: | Matsuda, Osamu Browse this author →KAKEN DB | | Tsutsui, Kandai Browse this author | | Vaudel, Gwenaelle Browse this author | | Pezeril, Thomas Browse this author | | Fujita, Kentaro Browse this author | | Gusev, Vitalyi Browse this author |
| Issue Date: | 22-Jun-2020 |
| Publisher: | American Physical Society (APS) |
| Journal Title: | Physical Review B |
| Volume: | 101 |
| Issue: | 22 |
| Start Page: | 224307 |
| Publisher DOI: | 10.1103/PhysRevB.101.224307 |
| Abstract: | Absorption of ultrashort laser pulses in a metallic grating deposited on a transparent sample launches in the material both compression/dilatation (longitudinal) and shear coherent acoustic pulses in directions of different orders of acoustic diffraction. The propagation of the emitted acoustic pulses can be monitored by measuring the variation of the optical reflectivity of the time-delayed ultrashort probe laser pulses. The direction of probe light incidence and its polarization relative to the sample surface as well as the orientation of the metallic grating should be specifically chosen for efficient Brillouin scattering of the probe light from shear phonons propagating in the elastically isotropic materials. As theoretically predicted, the obtained experimental data contain multiple frequency components which are due to a variety of possible Brillouin scattering angles for both shear and compression/dilatation coherent acoustic waves. All these different frequency components are explained through multiplexing the propagation directions of probe light and coherent sound by the metallic diffraction grating. Our experimental scheme of time-domain Brillouin scattering with metallic gratings operating in reflection mode provides access to monitoring the shear acoustic waves launched in the direction of the first diffraction order by backward Brillouin scattering process. Applications include simultaneous determination of several different acoustic mode velocities and optical refractive index and, potentially, measurements of the acoustic dispersion of samples with a single direction of possible optical access. |
| Rights: | Copyright (2020) by The American Physical Society. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/78973 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 松田 理
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