META 2021, META'12

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Control of sonic metamaterial stopband
Alasdair Murray, James Bell, Euan Hendry, Ian Summers, John Sambles, Alastair Hibbins

Last modified: 2012-02-28


The acoustic transmittance of a pair of closely-spaced plates, each perforated with a square array of subwavelength diameter holes, an “acoustic double fishnet” structure, is explored. For frequencies below onset of diffraction, there is a band of near-perfect acoustic attenuation at a frequency dictated by the periodicity of the array.  Comparison of experimental data with analytical modeling shows that the observed response is due to a hybridization between pipe modes within the holes and the two dimensional resonance supported in the gap between the periodically perforated plates.