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Rayleigh Waves in Locally Resonant Metamaterials by Farhad Zeighami; Antonio Palermo; Alessandro Marzani is a Engineering article available to read on EtoBox.

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The design of metamaterials for surface waves control is an emerging field of research which can impact several technical applications, from electronic devices based on surface acoustic waves (SAW) to wave barriers for seismic isolation. So far, studies on the interaction of surface waves with locally resonant metamaterials have been limited to the context of metasurfaces, i.e., thin resonant interfaces or structures attached to the free surface of a waveguide. In this work we remove this constraint by formulating an original dispersion relation for vertically polarized surface waves of the Rayleigh-type existing in resonant metamaterials. We consider the case of a resonant layer of thickness H coupled to a non-resonant half-space. To easily account for the resonant material while setting the dispersion relation, we propose a mixed dynamic-static homogenization approach, valid in the long wavelength regime. We show the existence of a band gap in the spectrum of the Rayleigh surface waves and relate its width to the region of negative effective density of the resonant metamaterial. We highlight how the thickness of the resonant layer affects the frequency stop-band and the magnitude

Who reads Rayleigh Waves in Locally Resonant Metamaterials?

Author

Farhad Zeighami; Antonio Palermo; Alessandro Marzani

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Engineering (Physical Sciences)