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Inverse Doppler Effects in Broadband Acoustic Metamaterials.

S L Zhai1, X P Zhao1, S Liu1

  • 1Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi'an, 710129, P.R. China.

Scientific Reports
|September 1, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed broadband acoustic metamaterials to achieve inverse Doppler effects. These novel metamaterials, inspired by flute designs, overcome previous limitations and enable negative refraction.

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Area of Science:

  • Acoustics
  • Metamaterials
  • Wave Physics

Background:

  • The Doppler effect describes frequency changes due to relative motion between wave sources and observers.
  • Veselago predicted inverse Doppler effects in negative refraction materials, explored via metamaterials.
  • Existing metamaterial designs for inverse Doppler effects often require complex, hard-to-achieve parameters.

Purpose of the Study:

  • To demonstrate a method for designing and characterizing arbitrary broadband acoustic metamaterials.
  • To overcome limitations in achieving broadband negative bulk modulus and mass density.
  • To experimentally realize negative refraction and inverse Doppler effects using acoustic metamaterials.

Main Methods:

  • Construction of omni-directional, double-negative acoustic metamaterials using 'flute-like' acoustic meta-cluster sets.
  • Utilizing seven double meta-molecules to form the metamaterial structure.
  • Experimental characterization of the designed acoustic metamaterials.

Main Results:

  • Successful design and experimental characterization of broadband acoustic metamaterials.
  • Demonstration of omni-directional, double-negative properties.
  • Observation of negative refraction and inverse Doppler effects, overcoming broadband limitations.

Conclusions:

  • A practical method for creating broadband acoustic metamaterials with inverse Doppler effects has been established.
  • The 'flute-like' metamaterial design offers a viable approach to achieving desired material parameters.
  • Inverse Doppler effects can be practically observed in acoustic systems, even those with historical significance like flutes.