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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

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Published on: December 27, 2012

Acoustic metamaterial with negative modulus.

Sam Hyeon Lee1, Choon Mahn Park, Yong Mun Seo

  • 1Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 10, 2011
PubMed
Summary

This study introduces an acoustic metamaterial with a negative effective modulus below 450 Hz. This novel material effectively blocks low-frequency sound waves, offering new possibilities for acoustic control.

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Area of Science:

  • Acoustics
  • Materials Science
  • Physics

Background:

  • Acoustic metamaterials offer unique wave manipulation properties.
  • Controlling sound propagation at low frequencies remains a significant challenge.

Purpose of the Study:

  • To experimentally and theoretically investigate an acoustic metamaterial.
  • To demonstrate negative effective modulus in a specific frequency range.
  • To explain the observed acoustic behavior through theoretical modeling.

Main Methods:

  • Fabrication of a one-dimensional acoustic metamaterial with an array of side holes on a tube.
  • Experimental measurement of acoustic wave propagation.
  • Theoretical analysis of the metamaterial's frequency characteristics.

Main Results:

  • The acoustic metamaterial exhibited a negative effective modulus from 0 to 450 Hz.
  • Acoustic waves above 450 Hz propagated well through the structure.
  • Sound transmission was effectively blocked below 450 Hz.

Conclusions:

  • The fabricated acoustic metamaterial successfully demonstrated tunable sound blocking below 450 Hz.
  • The observed frequency characteristics are analogous to plasma oscillations in metals.
  • The study provides a theoretical framework explaining the experimental findings.