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Filtering of elastic waves by opal-based hypersonic crystal.
Alexey S Salasyuk1, Alexey V Scherbakov, Dmitri R Yakovlev
1Ioffe Physical-Technical Institute of the Russian Academy of Sciences, St. Petersburg, Russia.
Nano Letters
|March 18, 2010
Summary
High-quality silica opal films function as 3D hypersonic crystals. Controlled sintering creates elastic bonds, forming band structures that separate surface acoustic waves from bulk waves.
Area of Science:
- Materials Science
- Acoustics
- Nanotechnology
Background:
- Silica opal films are synthesized with submicrometer-sized spheres.
- These structures can exhibit unique wave propagation properties.
Purpose of the Study:
- To investigate the potential of silica opal films as three-dimensional hypersonic crystals.
- To understand the formation of elastic band structures and their effect on wave propagation.
Main Methods:
- Fabrication of high-quality silica opal films via controlled sintering.
- Generation of broadband elastic wave packets using femtosecond laser pulses.
- Analysis of wave propagation and band structure formation.
Main Results:
- Demonstrated silica opal films as 3D hypersonic crystals operating in the 10 GHz range.
- Observed well-defined elastic bonding between silica spheres after sintering.
- Showcased band structure formation separating long-living surface acoustic waves from decaying bulk waves.
Conclusions:
- Controlled sintering of silica opal films creates functional hypersonic crystals.
- Elastic bonding strength dictates the separation of surface and bulk acoustic waves.
- These findings open possibilities for acoustic wave manipulation at high frequencies.
