Journal
PHYSICS LETTERS A
Volume 373, Issue 48, Pages 4464-4469Publisher
ELSEVIER
DOI: 10.1016/j.physleta.2009.10.013
Keywords
Acoustic metamaterial; Negative effective density; Membrane
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Funding
- National Research Foundation of Korea (NRF) [F01-2009-000-10028-0]
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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 omega(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. (C) 2009 Elsevier B.V. All rights reserved.
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