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Nano Lett. 2010 Apr 14;10(4):1319-23. doi: 10.1021/nl904126m.

Filtering of elastic waves by opal-based hypersonic crystal.

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  • 1Ioffe Physical-Technical Institute of the Russian Academy of Sciences, St. Petersburg, Russia.


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.

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