Acoustic geometric-phase meta-array

Abstract Metasurfaces based on geometric phase acquired from the conversion of optical spin states provide a robust control over wavefront light, and have been widely employed for construction various types functional metasurface devices. However, this powerful approach cannot be readily transferred to manipulation acoustic waves because do not possess degree freedom. Here, we propose concept geometric-phase meta-array by leveraging orbital angular momentum waves, where well-defined geometric-phases can attained through versatile topological charge processes. This work extends optics acoustics, provides new route wave control.