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We study the interaction of surface acoustic waves (SAWs) with thecontact-based, axial vibrational resonance of 1 \mu m silica microspheresforming a two-dimensional granular crystal adhered to a substrate. Thelaser-induced transient grating technique is used to excite SAWs and measuretheir 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 ouranalytical model, and find excellent agreement. The approach presented can beused to study the contact mechanics and adhesion of micro- and nanoparticles aswell as the dynamics of microscale granular crystals.

Interaction of a Contact Resonance of Microspheres with Surface Acoustic Waves