Spiral sound-diffusing metasurfaces based on holographic vortices.

ABSTRACT: In this work, we show that scattered acoustic vortices generated by metasurfaces with chiral symmetry present broadband unusual properties in the far-field. These metasurfaces are designed to encode the holographic field of an acoustical vortex, resulting in structures with spiral geometry. In the near field, phase dislocations with tuned topological charge emerge when the scattered waves interference destructively along the axis of the spiral metasurface. In the far field, metasurfaces based on holographic vortices inhibit specular reflections because all scattered waves also interfere destructively in the normal direction. In addition, the scattering function in the far field is unusually uniform because the reflected waves diverge spherically from the holographic focal point. In this wa

SUBMITTER: Jimenez N 

PROVIDER: S-EPMC8119454 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature