Issue Eur. Phys. J. Appl. Phys. Volume 48, Number 2, November 2009 Article Number 20501 Number of page(s) 6 Section Surfaces, Interfaces and Films DOI 10.1051/epjap/2009127 Published online 03 July 2009

Eur. Phys. J. Appl. Phys. 48, 20501 (2009)
DOI: 10.1051/epjap/2009127

Acoustically conceal an object with hearing

B. Liu and J.P. Huang

Department of Physics and Surface Physics Laboratory (National Key Laboratory), Fudan University, 220 Handan Road, Shanghai 200433, P.R. China

jphuang@fudan.edu.cn.

Received: 31 March 2009 / Received in final form: 27 April 2009 / Accepted: 6 May 2009 / Published online: 3 July 2009

Abstract
Following the concept of remote circular electromagnetic cloaks [Phys. Rev. Lett. 102, 093901 (2009)], here we exploit theoretically a class of rectangular cloaks that can acoustically cloak an object outside the cloaking shell. The cloaked object is no longer deafened by the cloaking shell, which is distinctly different from the existing acoustic cloaks. The function of such cloaks is justified by full wave simulations based on the finite element method. This work makes it possible to propose some applications like the stealth of submarines, which receive any incoming acoustic waves while keeping themselves undetectable to enemy's sonar devices.

PACS
43.20.+g - General linear acoustics.
43.35.+d - Ultrasonics, quantum acoustics, and physical effects of sound.
43.40.+s - Structural acoustics and vibration.

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