Nonresonant Metasurface for Fast Decoding in Acoustic Communications

Xue Jiang, Chengzhi Shi, Yuan Wang, Joseph Smalley, Jianchun Cheng, Xiang Zhang

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Acoustic communication is crucial in underwater exploration, where sound is the dominant information carrier, with significantly less loss and scattering than that of electromagnetic waves. However, the capacity of acoustic communication channels is limited due to the intrinsically low speed of sound relative to that of electromagnetic waves and because the attenuation of acoustic waves underwater increases with frequency. Recently, orbital angular momentum (OAM) has emerged as an alternative multiplexing degree of freedom to encode data onto vortex beams for increasing the capacity of acoustic communication. For information retrieval from the multiplexed acoustic vortices, an active scanning method and a passive resonant method are explored. Time-consuming scanning and complex postprocessing significantly restrict the data-transmission speed, while the large amount of resonant cascaded devices in the passive technique intrinsically results in a low efficiency and bulky volume of the system. Here, we propose and experimentally demonstrate a passive and nonresonant approach with the ability to separate different OAM states of multiplexed acoustic vortex beams in parallel using a parabolic-phased metasurface. The metasurface converts the spiral-phase patterns of vortex beams carrying various angular momenta into plane waves with different in-plane linear momenta. Our approach is compatible with multiplexing technologies, significantly enhancing the speed in acoustic communication.
Original languageEnglish (US)
JournalPhysical Review Applied
Volume13
Issue number1
DOIs
StatePublished - Jan 9 2020
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2022-06-14
Acknowledged KAUST grant number(s): OSR-2016-CRG5-2950-03
Acknowledgements: This work is supported by the Gordon and Betty Moore Foundation and the King Abdullah University of Science and Technology Office of Sponsored Research (OSR) (award OSR-2016-CRG5-2950-03). X.J. acknowledges support from the Youth Program of the National Natural Science Foundation of China (Grant No. 11904055).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

ASJC Scopus subject areas

  • General Physics and Astronomy

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