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Refraction, beam splitting and dispersion of GHz surface acoustic waves by a phononic crystal
| Title: | Refraction, beam splitting and dispersion of GHz surface acoustic waves by a phononic crystal |
| Authors: | Matsuda, Osamu Browse this author →KAKEN DB | | Koga, Hiroaki Browse this author →KAKEN DB | | Nishita, Hiroki Browse this author | | Tomoda, Motonobu Browse this author →KAKEN DB | | Otsuka, Paul H. Browse this author | | Wright, Oliver B. Browse this author →KAKEN DB |
| Keywords: | Picosecond laser ultrasonics | | Surface acoustic waves | | Time-resolved imaging | | Acoustic field | | Dispersion relation | | Phononic crystal |
| Issue Date: | Apr-2023 |
| Publisher: | Elsevier |
| Journal Title: | Photoacoustics |
| Volume: | 30 |
| Start Page: | 100471 |
| Publisher DOI: | 10.1016/j.pacs.2023.100471 |
| Abstract: | We exploit a time-resolved ultrafast optical technique to study the propagation of point-excited surface acoustic waves on a microscopic two-dimensional phononic crystal in the form of a square lattice of holes in a silicon substrate. Constant-frequency images and the dispersion relation are extracted, and the latter measured in detail in the region around the phononic band gap. Mode conversion and refraction at the interface between the phononic crystal and surrounding non-structured silicon substrate is studied at constant frequencies. Symmetric phonon beam splitting, for example, is shown to lead to a striking Maltese-cross pattern when phonons exit a square region of phononic crystal excited near its center. |
| Rights: | ©2023 The Author(s). Published by Elsevier GmbH. This is an open access article under the CC BY-NC-ND 4.0 license(https://creativecommons.org/licenses/by-nc-nd/4.0/) |
| Type: | article |
| URI: | http://hdl.handle.net/2115/89249 |
| 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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