Acoustic metamaterial with negative density

Sam Hyeon Lee, Choon Mahn Park, Yong Mun Seo, Zhi Guo Wang, Chul Koo Kim

Research output: Contribution to journalArticlepeer-review

349 Citations (Scopus)


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 ωc = 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.

Original languageEnglish
Pages (from-to)4464-4469
Number of pages6
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Issue number48
Publication statusPublished - 2009 Dec 7

Bibliographical note

Funding Information:
The research was partially supported by National Research Foundation of Korea ( NRF F01-2009-000-10028-0 ).

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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