Filtering of Elastic Waves by Opal-Based Hypersonic Crystal
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- 作者：Alexey S. Salasyuk ; Alexey V. Scherbakov ; Dmitri R. Yakovlev ; Andrey V. Akimov ; Alexander A. Kaplyanskii ; Saveliy F. Kaplan ; Sergey A. Grudinkin ; Alexey V. Nashchekin ; Alexander B. Pevtsov ; Valery G.
- 刊名：Nano Letters
- 出版年：2010
- 出版时间：April 14, 2010
- 年：2010
- 卷：10
- 期：4
- 页码：1319-1323
- 全文大小：313K
- 年卷期：v.10,no.4(April 14, 2010)
- ISSN：1530-6992
文摘
We report experiments in which high quality silica opal films are used as three-dimensional hypersonic crystals in the 10 GHz range. Controlled sintering of these structures leads to well-defined elastic bonding between the submicrometer-sized silica spheres, due to which a band structure for elastic waves is formed. The sonic crystal properties are studied by injection of a broadband elastic wave packet with a femtosecond laser. Depending on the elastic bonding strength, the band structure separates long-living surface acoustic waves with frequencies in the complete band gap from bulk waves with band frequencies that propagate into the crystal leading to a fast decay.