Colombi, Andrea, Roux, Philippe, Colquitt, Daniel 
ORCID: 0000-0001-5637-1626, Guenneau, Sebastien, Ageeva, Victoriya, Clark, Matt and Craster, Richard
(2016)
New frontiers in elastic metamaterials for controlling surface waves.
Journal of the Acoustical Society of America, 140 (4_Supp).
p. 3103.
Abstract
<jats:p>In this presentation, we show recent results obtained by our research group on two types of elastic metamaterial that are capable of controlling the propagation of surface elastic waves at various physical scales: from tens of meter in geophysics to millimeters in ultrasonic. We begin from the geophysical scale introducing a metamaterial that uses soft soil inclusions in the ground to create a lens for detouring seismic surface waves around an obstacle at frequency &lt;10 Hz. We then move to the smaller scale presenting a metamaterial that exploits the local resonances in a subwavelength collection of resonators (vertical rods) attached to a finite (plate) or semi-infinite (halfspace) substrate to control either the A0 mode in the plate or Rayleigh waves in the halfspace. We focus on the halfspace case and we illustrate how Rayleigh waves can be (1) mode converted into S-waves or stopped and trapped by a graded array of resonators (seismic rainbow); (2) focused, or detoured using a resonant metalens (Luneburg, Maxwell, and Eaton type) made with the vertical rods. The metamaterial are presented using results from time domain numerical simulations, laboratory and geophysical experiments to highlight the broad applicability of these objects across the wavelength spectrum.</jats:p>
| Item Type: | Article |
|---|---|
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 25 Oct 2023 10:59 |
| Last Modified: | 10 Nov 2023 10:09 |
| DOI: | 10.1121/1.4969683 |
| Open Access URL: | https://doi.org/10.1121/1.4969683 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3176438 |
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