Multi-dimensional eigenmodes induced by multi-slide dislocations in acoustic metamaterials

Abstract

Crystal defects, such as line defects and point defects, have been introduced into acoustic metamaterials for waveguiding and localization. Here, the slide dislocations are introduced into the acoustic metamaterials and the multi-dimensional eigenmodes which exhibit as the 2D surface eigenmodes, the 1D hinge eigenmodes and the 0D bound eigenmodes are yielded. The number of eigenmodes is consistent with the number of the air connecting cylinders at the slide interfaces. The experiments results show the highly efficient transmission of acoustic waves along the sliding surfaces and hinges, and verify the high energy localization of acoustic waves at the intersection of multi-sliding interfaces. Due to the high designability of acoustic metamaterials and slide interfaces, the developed multi-dimensional eigenmodes induced by multi-slide dislocations provide great platforms for the sound waveguiding and the energy recovering.