Time-domain imaging of gigahertz surface waves on an acoustic metamaterial
Author(s)Otsuka, Paul H; Mezil, Sylvain; Matsuda, Osamu; Tomoda, Motonobu; Boechler, Nicholas; Gusev, Vitalyi E; Wright, Oliver B; Maznev, Alexei; Gan, Tian; Fang, Xuanlai; ... Show more Show less
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We extend time-domain imaging in acoustic metamaterials to gigahertz frequencies. Using a sample consisting of a regular array of ~1 μm diameter silica microspheres forming a two-dimensional triangular lattice on a substrate, we implement an ultrafast technique to probe surface acoustic wave propagation inside the metamaterial area and incident on the metamaterial from a region containing no microspheres, which reveals the acoustic metamaterial dispersion, the presence of band gaps and the acoustic transmission properties of the interface. A theoretical model of this locally resonant metamaterial based on normal and shear-rotational resonances of the spheres fits the data well. Using this model, we show analytically how the sphere elastic coupling parameters influence the gap widths.
DepartmentMassachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Mechanical Engineering
New Journal of Physics
Otsuka, Paul H, Sylvain Mezil, Osamu Matsuda, Motonobu Tomoda, Alexei A Maznev, Tian Gan, Nicholas Fang, Nicholas Boechler, Vitalyi E Gusev, and Oliver B Wright. “Time-Domain Imaging of Gigahertz Surface Waves on an Acoustic Metamaterial.” New Journal of Physics 20, no. 1 (January 22, 2018): 013026.
Final published version