Acoustic metamaterial with negative density

We fabricated a one-dimensional acoustic metamaterial with negative effective density using an array of very thin elastic membranes. We observed acoustic equivalence of the plasma oscillation at ω c = 735 Hz . The metamaterial was opaque in the frequency range from 0 to 735 Hz, and was transparent a...

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Bibliographic Details
Published in:Physics letters. A 2009-12, Vol.373 (48), p.4464-4469
Main Authors: Lee, Sam Hyeon, Park, Choon Mahn, Seo, Yong Mun, Wang, Zhi Guo, Kim, Chul Koo
Format: Article
Language:English
Subjects:
Acoustic metamaterial
Membrane
Negative effective density
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Summary:We fabricated a one-dimensional acoustic metamaterial with negative effective density using an array of very thin elastic membranes. We observed acoustic equivalence of the plasma oscillation at ω c = 735 Hz . The metamaterial was opaque in the frequency range from 0 to 735 Hz, and was transparent above 735 Hz. We report direct observation of negative acceleration in this acoustic medium below 735 Hz. The frequency characteristics of the metamaterial have the same form as that of metals with negative permittivity. We also provide a simple theory to explain the experimental results.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2009.10.013