Acoustic Bessel Vortex Beam by Quasi-Three-Dimensional Reflected Metasurfaces.

ABSTRACT: Vortex beams have a typical characteristic of orbital angular momentum, which provides a new degree of freedom for information processing in remote communication and a form of non-contact manipulation for trapping particles. In acoustics, vortex beams are generally observed on the surface of a metamaterial structure or in a waveguide with a hard boundary owing to the characteristic of easy diffusion in free space. The realization of an acoustic vortex beam with a long-distance propagation in free space still remains a challenge. To overcome this, we report a type of acoustic Bessel vortex (ABV) beam created by a quasi-three-dimensional reflected metasurface in free space based on phase modulation. By using the Bessel and vortex phase profiles, we can realize an ABV beam with the high perfo

SUBMITTER: Wang Y 

PROVIDER: S-EPMC8623545 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature