Design of sawtooth-shaped acoustic metasurface for sound field manipulation

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 for manufacturing and large-scale applications. To this end, our study proposes a sawtooth-shaped metasurface with a simple configuration, easy fabrication and good wave control capability. First, we use "apparent wavefront theory" and "lattice diffraction theory" to predict the main reflected angles of sawtooth metasurfaces. Then, numerical simulations were performed to validate the theories used and to analyze the conditions of their applicability. Finally, several sawtooth metasurfaces were designed to realize different functions such as large-angle reflection, acoustic focusing and uniform diffusion, which can also be verified experimentally. In general terms, the sawtooth-shaped metasurface has broad prospects in the field of acoustics.