Locally Resonant Sonic Materials

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Science  08 Sep 2000:
Vol. 289, Issue 5485, pp. 1734-1736
DOI: 10.1126/science.289.5485.1734

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We have fabricated sonic crystals, based on the idea of localized resonant structures, that exhibit spectral gaps with a lattice constant two orders of magnitude smaller than the relevant wavelength. Disordered composites made from such localized resonant structures behave as a material with effective negative elastic constants and a total wave reflector within certain tunable sonic frequency ranges. A 2-centimeter slab of this composite material is shown to break the conventional mass-density law of sound transmission by one or more orders of magnitude at 400 hertz.

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