Abstract

Phononic slabs of an fcc phononic crystal consisting of close-packed (glued) rubber spheres in air, under the influence of mild dissipation in rubber, exhibit large absolute transmission gaps. Proper size variation of the spheres in a sequence of crystal slabs can shift and enlarge the frequency gap readily to comply with a variety of filtering needs in a phononic application. The aspects of such a versatile phononic slab are presented in a realistic theoretical approach, by means of the layer multiple-scattering method developed for phononic crystals.

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