Emitting long-distance spiral airborne sound using low-profile planar acoustic antenna.

ABSTRACT: Recent years have witnessed a rapidly growing interest in exploring the use of spiral sound carrying artificial orbital angular momentum (OAM), toward establishing a spiral-wave-based technology that is significantly more efficient in energy or information delivering than the ordinary plane wave technology. A major bottleneck of advancing this technology is the efficient excitation of far-field spiral waves in free space, which is a must in exploring the use of spiral waves for long-distance information transmission and particle manipulation. Here, we report a low-profile planar acoustic antenna to modulate wavefronts emitted from a near-field point source and achieve far-field spiral airborne sound carrying OAM. Using the holographic interferogram as a 2D modulated artificial acoustic imp

SUBMITTER: Gao S 

PROVIDER: S-EPMC8012347 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature