Acoustic Metamaterial
Résumé
Over the past decade, electromagnetic metamaterials have shown
tremendous potential in many disciplines of science and technology,
and have led to a broad interest in devising techniques for
manipulating different classes of waves with unconventional materials.
Among them, acoustic metamaterials show the greatest promise
for manipulating acoustic waves in a novel fashion for imaging, communication,
detection and sound protection applications. Because of
similar governing equations of electromagnetic waves and acoustic
waves, which are the Maxwell equations and Helmholtz equations,
respectively, the successes of metamaterials study in electromagnetic
wave can be extended to the acoustic community. Permittivity
and permeability of materials are used to describe electromagnetic
wave properties, while acoustic wave properties are determined by the mass density and compressibility of materials.
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