Reflected wavefront manipulation by acoustic metasurface with anisotropic local resonant units


Abstract in English

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 Snells 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.

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