Coupled Membranes with Doubly Negative Mass Density and Bulk Modulus

Min Yang, Guancong Ma, Zhiyu Yang, Ping Sheng

Research output: Contribution to journalJournal articlepeer-review

315 Citations (Scopus)


We present a structurally and conceptually simple acoustic double negative metamaterial comprising two coupled membranes. Owing to its symmetry, the system can generate both monopolar and dipolar resonances that are separately tunable, thereby making broadband double negativity possible. A homogenization scheme is implemented that enables the exact characterization of our metamaterial by the effective mass density and bulk modulus even beyond the usual long-wavelength regime, with the measured displacement fields on the sample's surfaces as inputs. Double negativity is achieved in the frequency range of 520-830 Hz. Transmission and reflection predictions using effective parameters are shown to agree remarkably well with the experiment.

Original languageEnglish
Article number134301
Number of pages5
JournalPhysical Review Letters
Issue number13
Publication statusPublished - 29 Mar 2013

Scopus Subject Areas

  • Physics and Astronomy(all)


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