Improving the performance of acoustic invisibility with multilayer structure based on scattering analysis

doi:10.1088/1674-1056/25/12/124302

Abstract

In this paper, acoustic scattering from the system comprised of a cloaked object and the multilayer cloak with only one single pair of isotropic media is analyzed with a recursive numerical method. The designed acoustic parameters of the isotropic cloak media are assumed to be single-negative, and the resulting cloak can reduce acoustic scattering from an acoustic sensor while allowing it to receive external information. Several factors that may influence the performance of the cloak, including the number of layers and the acoustic dissipation of the medium are fully analyzed. Furthermore, the possibility of achieving acoustic invisibility with positive acoustic parameters is proposed by searching the optimum value in the parameter space and minimizing the scattering cross-section.

Keywords: metamaterials acoustic cloaking scattering invisibility

Received: 29 April 2016
Revised: 23 June 2016
Accepted manuscript online:

PACS:	43.20.-f	(General linear acoustics)
	43.35.+d	(Ultrasonics, quantum acoustics, and physical effects of sound)
	62.90.+k	(Other topics in mechanical and acoustical properties of condensed matter)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11274168, 11374157, 11174138, 11174139, 11222442, and 81127901) and the National Basic Research Program of China (Grant Nos. 2010CB327803 and 2012CB921504).

Corresponding Authors: Xin-Ye Zou
E-mail: xyzou@nju.edu.cn

Cite this article:

Chen Cai(蔡琛), Yin Yuan(袁樱), Wei-Wei Kan(阚威威), Jing Yang(杨京), Xin-Ye Zou(邹欣晔) Improving the performance of acoustic invisibility with multilayer structure based on scattering analysis 2016 Chin. Phys. B 25 124302

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Improving the performance of acoustic invisibility with multilayer structure based on scattering analysis

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