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Advances in Condensed Matter Physics
Volume 2018, Article ID 5452071, 7 pages
https://doi.org/10.1155/2018/5452071
Research Article

Anomalous Reflection of Acoustic Waves in Air with Metasurfaces at Low Frequency

College of Physics and Electronic Information Engineering, Engineering Research Center of Nanostructure and Functional Materials, Ningxia Normal University, Guyuan 756000, China

Correspondence should be addressed to Huaijun Chen; moc.361@97nujiauhnehc

Received 30 October 2017; Accepted 24 December 2017; Published 31 January 2018

Academic Editor: Yuri Tarasevich

Copyright © 2018 Huaijun Chen. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An acoustic metasurface made of a composite structure of cavity and membrane is proposed and numerically investigated. The target frequency is in the low frequency regime (570 Hz). The unit cells, which provide precise local phase modulation, are rather thin with thickness in the order around 1/5 of the working wavelength. The numerical simulations show that the designed metasurface can steer the reflected waves at will. By taking the advantage of this metasurface, an ultrathin planar acoustic axicon, acoustic lens, and acoustic nondiffracting Airy beam generator are realized. Our design method provides a new approach for the revolution of future acoustic devices.