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Theory and Design of Practical Metamaterials for Acoustic Cloaking

[+] Author Affiliations
Bogdan-Ioan Popa, Steven A. Cummer

Duke University, Durham, NC

Paper No. IMECE2009-11254, pp. 113-114; 2 pages
doi:10.1115/IMECE2009-11254
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 15: Sound, Vibration and Design
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4388-8 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

Significant research has recently been dedicated to reducing the interaction between acoustic waves and given objects. The coordinate transformation theory provides an elegant approach to the design of coatings capable of reaching this goal. First demonstrated for electromagnetic waves [1], this method has later been adapted to acoustic waves [2–5]. Its appeal stems from its generality: it can be applied to obtain coatings capable to conceal objects of arbitrary shapes and sizes. Moreover, its efficacy depends only on our ability to create materials having the right acoustic properties. However, these properties are quite restrictive. They include inhomogeneity, i.e. material parameters that vary continuously with position, and a high degree of anisotropy. In practice, one would relax these constraints but reduce the performance of the design. For example, in many instances an inhomogeneous material can be approximated by thin layers of homogeneous media. However, a large number of such layers are usually required to obtain acceptable results [6].

Copyright © 2009 by ASME

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