Wide-Angle Broadband Nonreflecting Acoustic Metamaterial Fence

Chenkai Liu, Chu Ma, Xinhao Li, Jie Luo, Nicholas X. Fang, and Yun Lai

Phys. Rev. Applied 13, 054012 – Published 6 May 2020

Abstract

In this work, we theoretically propose and experimentally demonstrate a kind of nonreflecting acoustic metamaterial fence that is perfectly impedance matched to air over a wide range of incident angles and a broad frequency band. The metamaterial fence is composed of an array of rigid cylinders with alternating layers of different cylinder diameters. It is designed by a spatially dispersive effective medium theory and experimentally demonstrated by airborne sound reflectance measurements. Our work provides a unique approach to design and realize rigid acoustic structures that can robustly prohibit reflection and reverberation. Such structures may have important applications in general acoustics.

Received 12 November 2019
Revised 13 February 2020
Accepted 30 March 2020

DOI:https://doi.org/10.1103/PhysRevApplied.13.054012

Physics Subject Headings (PhySH)

Acoustic metamaterials Acoustic wave phenomena Architectural acoustics

2-dimensional systems

Acoustic techniques Band structure methods Finite-element method

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Chenkai Liu ^1,2,‡, Chu Ma ^2,3,‡, Xinhao Li², Jie Luo¹, Nicholas X. Fang^2,†, and Yun Lai^4,*

¹School of Physical Science and Technology, Soochow University, Suzhou 215006, China
²Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
³Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Wisconsin 53706, USA
⁴MOE Key Laboratory of Modern Acoustics, National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

^*laiyun@nju.edu.cn
^†nicfang@mit.edu
^‡These authors contributed equally to this work.

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Vol. 13, Iss. 5 — May 2020

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Physical Review Applied