Acoustic birefringence via non-Eulerian metamaterials

The recently proposed concept of metamaterials has opened exciting venues to control wave-matter interactions in unprecedented ways. Here, we demonstrate the relevance of metamaterials for inducing acoustic birefringence, a phenomenon which has already found its versatile applications in optics in designing light modulators or filters, and nonlinear optic components. This is achieved in a suitably designed acoustic metamaterial which is non-Eulerian, in the sense that at low frequencies, it cannot be homogenized to a uniform acoustic medium whose behavior is characterized by the Euler equation. Thanks to the feasibility of engineering its subwavelength structure, such a non-Eulerian metamaterial allows one to desirably manipulate the birefringence process. Our findings may give rise to the generation of novel devices such as tunable acoustic splitters and filters.


Publié dans:
Journal of Applied Physics, 126, 3, 034902
Année
Jul 18 2019
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 Notice créée le 2019-07-19, modifiée le 2019-12-05

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