Anisotropic Complementary Acoustic Metamaterial for Canceling out Aberrating Layers
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PhysRevX.4.041033.pdf
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Author(s)
Shen, Chen
Xu, Jun
Jing, Yun
Fang, Nicholas Xuanlai
Date Issued
November 2014
Journal
Physical Review X
Publisher
American Physical Society
Citation
Shen, Chen, Jun Xu, Nicholas X. Fang, and Yun Jing. "Anisotropic complementary acoustic metamaterial for canceling out aberrating layers." Phys. Rev. X 4, 041033 (November 2014).
Version
Final published version
Abstract
In this paper, we investigate a type of anisotropic, acoustic complementary metamaterial (CMM) and its application in restoring acoustic fields distorted by aberrating layers. The proposed quasi two-dimensional (2D), nonresonant CMM consists of unit cells formed by membranes and side branches with open ends. Simultaneously, anisotropic and negative density is achieved by assigning membranes facing each direction (x and y directions) different thicknesses, while the compressibility is tuned by the side branches. Numerical examples demonstrate that the CMM, when placed adjacent to a strongly aberrating layer, could acoustically cancel out that aberrating layer. This leads to dramatically reduced acoustic field distortion and enhanced sound transmission, therefore virtually removing the layer in a noninvasive manner. In the example where a focused beam is studied, using the CMM, the acoustic intensity at the focus is increased from 28% to 88% of the intensity in the control case (in the absence of the aberrating layer and the CMM). The proposed acoustic CMM has a wide realm of potential applications, such as cloaking, all-angle antireflection layers, ultrasound imaging, detection, and treatment through aberrating layers.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevX.4.041033
