Magnetically controlled multifunctional membrane acoustic metasurface

Abstract

Acoustic artificial structures have attracted great interest due to their unique capacity in manipulating acoustic waves. Among them, acoustic metasurfaces are highlighted for tuning acoustic waves in the subwavelength scale, which is expected for realizing acoustic device miniaturization. However, traditional acoustic metasurfaces are passive and non-multifunctional, which limits their further practical applications. In this paper, a magnetically controlled approach is investigated for achieving a multifunctional acoustic metasurface. The properties of the proposed acoustic metasurface, consisting of elastic films and additional mass, could be continuously modulated by magnetic force. Through switching the magnetic forces, the transmitted acoustic wave is easily tailored and different functions such as focusing, beam-splitting-like, and other near-field acoustic displays are switched. This work extends the research of multifunctional metasurfaces and has excellent potential in a wide range of applications including acoustic imaging, communications, and particle manipulation (such as suspension and acoustic tweezers).