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Broadband Acoustic Hyperbolic Metamaterial.

Chen Shen1, Yangbo Xie2, Ni Sui1

  • 1Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA.

Physical Review Letters
|January 2, 2016
PubMed
Summary
This summary is machine-generated.

We designed a novel acoustic hyperbolic metamaterial with unique properties for manipulating sound waves. This metamaterial enables subwavelength imaging and partial focusing, with potential applications in medical imaging and nondestructive testing.

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Area of Science:

  • Acoustics
  • Materials Science
  • Wave Physics

Background:

  • Metamaterials offer unique wave manipulation properties not found in natural materials.
  • Hyperbolic metamaterials exhibit unique dispersion relations, enabling exotic phenomena.
  • Acoustic metamaterials are being explored for advanced wave control applications.

Purpose of the Study:

  • To design and experimentally characterize a broadband acoustic hyperbolic metamaterial.
  • To demonstrate the hyperbolic dispersion and associated wave phenomena.
  • To explore potential applications in acoustic imaging and wave manipulation.

Main Methods:

  • Design of a metamaterial composed of multiple arrays of clamped thin plates.
  • Experimental characterization of acoustic properties and wave propagation.
  • Demonstration of partial focusing and subwavelength imaging at specific frequencies.

Main Results:

  • The metamaterial exhibits opposite signs of effective density in orthogonal directions below a cutoff frequency.
  • A hyperbolic dispersion relation was achieved.
  • Successful experimental demonstration of partial focusing and subwavelength imaging between 1.0 and 2.5 kHz.

Conclusions:

  • The developed acoustic hyperbolic metamaterial offers broadband operation.
  • The metamaterial enables significant control over acoustic wave propagation.
  • Potential applications include advanced medical imaging and nondestructive testing.