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Broadband Acoustic Cloak for Ultrasound Waves

Shu Zhang, Chunguang Xia, and Nicholas Fang
Phys. Rev. Lett. 106, 024301 – Published 10 January 2011
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Abstract

Invisibility devices based on coordinate transformation have opened up a new field of considerable interest. We present here the first practical realization of a low-loss and broadband acoustic cloak for underwater ultrasound. This metamaterial cloak is constructed with a network of acoustic circuit elements, namely, serial inductors and shunt capacitors. Our experiment clearly shows that the acoustic cloak can effectively bend the ultrasound waves around the hidden object, with reduced scattering and shadow. Because of the nonresonant nature of the building elements, this low-loss (6dB/m) cylindrical cloak exhibits invisibility over a broad frequency range from 52 to 64 kHz. Furthermore, our experimental study indicates that this design approach should be scalable to different acoustic frequencies and offers the possibility for a variety of devices based on coordinate transformation.

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  • Received 12 September 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.024301

© 2011 The American Physical Society

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Invisibility cloak for ultrasonic waves

Published 10 January 2011

A cloak that can make an object undetectable by ultrasonic water waves has been successfully demonstrated.

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Authors & Affiliations

Shu Zhang, Chunguang Xia, and Nicholas Fang*

  • Department of Mechanical Science & Engineering and the Beckman Institute of Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana-Champaign, Illinois 61801, USA

  • *nicfang@illinois.edu

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Issue

Vol. 106, Iss. 2 — 14 January 2011

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