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Accueil > Publications > 2013

Soft Acoustic Metamaterials

par Leng Jacques - publié le

Resonance phenomena occur with all types of vibrations or waves and may play a part in spectacular events, such as the collapse of structures ??for example, the fall of the Broughton suspension bridge near Manchester in 1831 (1). Indeed, the oscillations of a structure submitted to harmonic excitation reaches its maximum amplitude at the resonance frequency ?0 of the system. At low driving frequencies (? < ?0), its response is in phase with the forcing but becomes out of phase just beyond (?0 < ?). Such an out-of-phase response has been exploited with  ??locally resonant materials ? (2). The proposed strategy is to embed a large enough collection of identical mechanical resonators in a passive structure to control wave propagation. These features are used to reach unusual macroscopic behaviors such as ultradamping of noise or negative refraction for imaging (3).