Reflected wavefront manipulation by acoustic metasurface with anisotropic local resonant units

TL;DR

This paper introduces an innovative acoustic metasurface using composite units to control reflected wavefronts, enabling anomalous reflection, planar lensing, and acoustic invisibility with potential applications in wave manipulation.

Contribution

It presents a novel acoustic metasurface design based on three-component composites for advanced wavefront control and invisibility applications.

Findings

Achieved anomalous reflection and planar acoustic lensing.

Demonstrated acoustic invisibility using composite metasurface.

Enabled wavefront manipulation with changeable resonant units.

Abstract

Metasurfaces with planar profile and wave front shaping capabilities would be ideally suitable to improve the performance of acoustic wave-based applications. It is significant that the general Snell's law provides a new approach to engineer the phase profile of reflected acoustic wave. Here, we present a new type of acoustic metasurface based on three-component composites which contain a steel ball coated with a thin elliptical layer of silicone rubber and embedded in epoxy. The acoustic metasurface with changeable radii of steel balls can realize the anomalous reflections, a planar acoustic lens through designed gradient phase profile. The acoustic metasurface contained with elaborately selected three-component composites, as a skin cloak, successfully achieve the acoustical invisibility.