Acoustic energy transport based on the local state characteristics of a symmetric interface

Abstract

To explore the directional transmission channel that can efficiently transport acoustic energy, we analyzed the local state characteristics of a mirror symmetric interface (MSI) in an artificial periodic structure. It was found that in a one-dimensional (1D) waveguide structure with alternating high- and low-resonant units, the acoustic energy can be localized at the symmetric interface. The result can be extended to a 2D waveguide array, implying that the acoustic energy can be transported efficiently along the interface. In addition, to improve the robustness of the acoustic system, we designed a graphene-like periodic structure based on a hexagonal lattice. By breaking the six-fold rotation symmetry of the structure, the topological interface was constructed, and the backscattering of the acoustic wave was effectively suppressed, enabling the acoustic wave energy to be transported with low reflection even in the curved waveguide. These results may provide a new direction for the realization of high-tech applications such as micromotor and 2D integrated communication.