Anomalous Manipulation of Acoustic Wavefront With an Ultrathin Planar Metasurface

Author:

Zhai Shilong1,Ding Changlin1,Chen Huaijun1,Shen Fangliang1,Luo Chunrong1,Zhao Xiaopeng2

Affiliation:

1. Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710129, China

2. Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710129, China e-mail:

Abstract

The investigations of metasurfaces have introduced a new direction in researching metamaterials. We propose an ultrathin acoustic metasurface consisting of a series of structurally simple microunits. The microunit is constructed with a cavity filled with air and a membrane to seal the air. The designed metasurfaces can arbitrarily manipulate the reflected sound waves at 3.7 kHz. We also realize the planar focusing effects by elaborately arranging the microunits on the metasurfaces, including an axicon and a lens. The designed metamaterials may promote the development of many acoustic devices, such as cloaking, absorber, and spectrum splitter.

Publisher

ASME International

Subject

General Engineering

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