Acoustic Metameterial with Negative Modulus

Details Acoustic Metameterial with Negative Modulus Acoustic Metameterial with Negative Modulus

2008-12-16

arxiv.org/abs/0812.2952v2

J. Phys.: Condens. Matter 21(2009) 175704

Physics

Condensed Matter

Materials Science

Scientific paper

We present experimental and theoretical results on an acoustic metamaterial that exhibits negative effective modulus in a frequency range from 0 to 450 Hz. One-dimensional acoustic metamaterial with an array of side holes on a tube was fabricated. We observed that acoustic waves above 450 Hz propagated well in this structure, but no sound below 450 Hz passed through. The frequency characteristics of the metamaterial has the same form as that of the permittivity in metals due to the plasma oscillation. We also provide a theory to explain the experimental results.

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