Acoustic metamaterial exhibiting four different sign combinations of density and modulus

Yong Mun Seo, Jong Jin Park, Seung Hwan Lee, Choon Mahn Park, Chul Koo Kim, Sam Hyeon Lee

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We fabricated a double negative acoustic metamaterial which consisted of Helmholtz resonators and membranes. Experimental data on the transmission and dispersion relation are presented. The system exhibited three frequencies where the acoustic state makes sharp transitions from density negative (ρ-NG) to double negative (DNG), modulus negative (B-NG), and double positive (DPS) in sequence with the frequency. We observed a wide range of negative refractive indexes from -0.06 to -3.7 relative to air, which will allow for new acoustic transformation techniques.

Original languageEnglish
Article number023504
JournalJournal of Applied Physics
Issue number2
Publication statusPublished - 2012 Jan 15


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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