Chapter

Acoustic Metamaterials

Volume 166 of the series Springer Series in Materials Science pp 169-195

Anisotropic Metamaterials for Transformation Acoustics and Imaging

  • Jensen LiAffiliated withDepartment of Physics and Materials Science, City University of Hong Kong Email author 
  • , Zixian LiangAffiliated withDepartment of Physics and Materials Science, City University of Hong Kong
  • , Jie ZhuAffiliated withNSF Nanoscale Science and Engineering Center (NSEC), University of California
  • , Xiang ZhangAffiliated withNSF Nanoscale Science and Engineering Center (NSEC), University of California

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Abstract

Metamaterials are becoming a prominent class of artificial materials that allow us to have very precise and specific optical properties. Its associated engineering flexibility opens up a wide range of applications and provides an effective route in molding the flow of energy. By drawing analogies between electromagnetic and acoustic wave frameworks, many concepts like invisibility cloaking and subwavelength imaging can be transplanted from electromagnetic to acoustic waves easily. However, we need quite different ways of constructing the artificial materials and devices for acoustics. Here, we show how anisotropic metamaterials can be constructed to control the constitutive parameters of the effective medium through positioning hard plates in different preferred directions. We will then use them to construct an acoustic carpet cloak, an acoustic hyperlens and a superlens as examples.