Design of sawtooth-shaped acoustic metasurface for reflective wave manipulation

Abstract

Currently, the goal of research on acoustic metasurfaces is mainly focused on achieving ultimate sound wave control, which often requires complex structural design. However, complex structures are often difficult to fabricate and apply on a large scale. To this end, our study investigates a sawtooth-shaped metasurface with a simple configuration, easy fabrication and good wave control capability. First, we used the “apparent wavefront theory” and the “lattice diffraction theory” to predict the main reflected angles induced by sawtooth metasurfaces with varying tooth angles. Then, numerical simulations were performed to validate the theories used and to analyze the conditions of their applicability. Finally, several configurations of sawtooth metasurfaces were designed to realize different functions such as large-angle deflection, acoustic focusing and uniform diffusion, which can also be verified experimentally. In general terms, the sawtooth-shaped metasurface has broad prospects in sound wave manipulation.