Journal of Physics Condensed Matter · 2009 · 298 citations · 27 references
Natural SciencesMaterials SciencePhysicsAcousticsMetallic MaterialsPropagationAcoustic MaterialsAcoustic MetamaterialsAcoustic Wave PropagationStructural AcousticsAcoustic WavesMetamaterial Wave PropagationMetamaterialsNegative Bulk Modulus
Its frequency response mirrors that of metal permittivity governed by plasma oscillation. The study aims to provide a theoretical explanation for these experimental observations. The authors fabricated a one‑dimensional acoustic metamaterial consisting of a tube with an array of side holes. The metamaterial exhibits a negative effective modulus between 0 and 450 Hz, blocking sound below that threshold while allowing propagation above it.
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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