Interaction of a Contact Resonance of Microspheres with Surface Acoustic Waves

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...

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Bibliographic Details
Main Authors: Boechler, Nicholas (Contributor), Eliason, Jeffrey Kristian (Contributor), Kumar, Anshuman (Contributor), Maznev, Alexei (Contributor), Nelson, Keith Adam (Contributor), Fang, Nicholas Xuanlai (Contributor)
Other Authors: Massachusetts Institute of Technology. Department of Chemistry (Contributor), Massachusetts Institute of Technology. Department of Mechanical Engineering (Contributor)
Format: Article
Language:English
Published: American Physical Society, 2013-09-16T15:49:22Z.
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Description
Summary: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.
United States. Defense Threat Reduction Agency (Grant HDTRA 1-12-1-0008)
National Science Foundation (U.S.) (Grant CMMI-1120724)