META Conference, META'12

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A quasi two-dimensional acoustic metamaterial with negative bulk modulus
Victor M Garcia-Chocano, Roge Gracia, Francisco Cervera, Daniel Torrent, Jose Sanchez-Dehesa

Last modified: 2011-12-30

Abstract


A quasi two-dimensional acoustic metamaterial with negative bulk modulus is proposed, fabricated and experimentally characterized. The structure consists of a two dimensional array of cylindrical boreholes opened to a waveguide. Experiments are performed using a slab of seven layers and the effective parameters are extracted from the measured transmission and reflection spectra. The skin depth is the region with negative modulus is also determined as a function of frequency. The data are well supported by a semi-analytical model based on multiple scattering and by finite elements simulations.

Keywords


acoustic metamaterial, negative bulk modulus