Elastodynamic metasurface: Depolarization of mechanical waves and time effects

Boutin, C, Schwan, LML and Dietz, MS 2015, 'Elastodynamic metasurface: Depolarization of mechanical waves and time effects' , Journal of Applied Physics, 117 (6) , 064902.

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Abstract

We report the concept of microstructured surfaces with inner resonance in the field of elastodynamics, so-called elastodynamic metasurfaces. Such metasurfaces allow for wavefield manipulation of mechanical waves by tuning the boundary conditions at specific frequencies. In particular, they can be used to depolarize elastic waves without introducing heterogeneities in the medium itself; the physical means to do so in homogeneous elastic media used to remain, surprisingly, an open question while depolarization is commonplace in electromagnetism. The principle relies on the anisotropic behaviour of a subwavelength array of resonators: Their subwavelength configuration confines the Bragg interferences scattered by resonators into a boundary layer. The effective behaviour of the resonating array is expressed with homogenization as an unconventional impedance, the frequency-dependence, and anisotropy of which lead to depolarization and time effects. The concept of the elastodynamic metasurface is tested experimentally and results bear testament to its efficacy and robustness. Elastodynamic metasurfaces are easily realized and analytically predictable, opening new possibilities in tomography techniques, ultrasonics, geophysics, vibration control, materials and structure design

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Journal of Applied Physics
Publisher: American Institute of Physics
ISSN: 0021-8979
Depositing User: WM Taylor
Date Deposited: 21 Oct 2016 10:51
Last Modified: 21 Oct 2016 10:51
URI: http://usir.salford.ac.uk/id/eprint/40440

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