Interaction of a contact resonance of microspheres with surface acoustic waves

N. Boechler, J. K. Eliason, A. Kumar, A. A. Maznev, K. A. Nelson, N. Fang

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112 Scopus citations


We study the interaction of surface acoustic waves (SAWs) with a contact-based vibrational resonance of 1 μm silica microspheres forming a two-dimensional granular crystal adhered to a substrate. The laser-induced transient grating technique is used to excite SAWs and measure their dispersion. The measured dispersion curves exhibit "avoided crossing" behavior due to the hybridization of the SAWs with the microsphere resonance. We compare the measured dispersion curves with those predicted by our analytical model and find excellent agreement. The approach presented can be used to study the contact mechanics and adhesion of micro- and nanoparticles as well as the dynamics of microscale granular crystals.

Original languageEnglish (US)
Article number036103
JournalPhysical review letters
Issue number3
StatePublished - Jul 17 2013
Externally publishedYes


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