中国物理B ›› 2011, Vol. 20 ›› Issue (11): 114301-114301.doi: 10.1088/1674-1056/20/11/114301

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Acoustic carpet invisibility cloak with two open windows using multilayered homogeneous isotropic material

向志海1, 岑章志1, 任春雨2   

  1. (1)Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China; (2)Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China; Department of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan 430033, China
  • 收稿日期:2011-02-23 修回日期:2011-05-06 出版日期:2011-11-15 发布日期:2011-11-15

Acoustic carpet invisibility cloak with two open windows using multilayered homogeneous isotropic material

Ren Chun-Yu(任春雨)a)b), Xiang Zhi-Hai(向志海) a)† , and Cen Zhang-Zhi(岑章志)a)   

  1. a Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China; b Department of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan 430033, China
  • Received:2011-02-23 Revised:2011-05-06 Online:2011-11-15 Published:2011-11-15

摘要: We present a method for designing an open acoustic cloak that can conceal a perturbation on flat ground and simultaneously meet the requirement of communication and matter interchange between the inside and the outside of the cloak. This cloak can be constructed with a multilayered structure and each layer is an isotropic and homogeneous medium. The design scheme consists of two steps: firstly, we apply a conformal coordinate transformation to obtain a quasi-perfect cloak with heterogeneous isotropic material; then, according to the profile of the material distribution, we degenerate this cloak into a multilayered-homogeneous isotropic cloak, which has two open windows with negligible disturbance on its invisibility performance. This may greatly facilitate the fabrication and enhance the applicability of such a carpet-type cloak.

关键词: transformation method, acoustic wave, carpet cloak, multilayered structure

Abstract: We present a method for designing an open acoustic cloak that can conceal a perturbation on flat ground and simultaneously meet the requirement of communication and matter interchange between the inside and the outside of the cloak. This cloak can be constructed with a multilayered structure and each layer is an isotropic and homogeneous medium. The design scheme consists of two steps: firstly, we apply a conformal coordinate transformation to obtain a quasi-perfect cloak with heterogeneous isotropic material; then, according to the profile of the material distribution, we degenerate this cloak into a multilayered-homogeneous isotropic cloak, which has two open windows with negligible disturbance on its invisibility performance. This may greatly facilitate the fabrication and enhance the applicability of such a carpet-type cloak.

Key words: transformation method, acoustic wave, carpet cloak, multilayered structure

中图分类号:  (General linear acoustics)

  • 43.20.+g
43.20.Fn (Scattering of acoustic waves)