GHz extraordinary acoustic transmission of bulk waves through nanostructures

Acoustic metamaterials are manmade structures designed to manipulate the propagation of sound not available in naturally occuring materials. One interesting phenomena in this field is extraordinary acoustic transmission, the passage of more acoustic energy than expected through a small sub-wavelength aperture. This has been extensively studied in liquid-solid or air-solid systems [1],[2], but to our knowledge not for waves purely confined to solids. Here we investigate extraordinary acoustic transmission (EAT) in a solid-solid structure at GHz frequencies by simulation. 2. Simulation