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Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces

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Title: Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces
Authors: Colombi, A
Ageeva, V
Smith, RJ
Clare, A
Patel, R
Clark, M
Colquitt, D
Roux, P
Guenneau, S
Craster, RV
Item Type: Journal Article
Abstract: Recent years have heralded the introduction of metasurfaces that advantageously combine the vision of sub- wavelength wave manipulation, with the design, fabrication and size advantages associated with surface excitation. An important topic within metasurfaces is the tailored rainbow trapping and selective spatial frequency separation of electromagnetic and acoustic waves using graded metasurfaces. This frequency dependent trapping and spatial frequency segregation has implications for energy concentrators and associated energy harvesting, sensing and wave filtering techniques. Different demonstrations of acoustic and electromagnetic rainbow devices have been performed, however not for deep elastic substrates that support both shear and compressional waves, together with surface Rayleigh waves; these allow not only for Rayleigh wave rainbow effects to exist but also for mode conversion from surface into shear waves. Here we demonstrate experimentally not only elastic Rayleigh wave rainbow trapping, by taking advantage of a stop-band for surface waves, but also selective mode conversion of surface Rayleigh waves to shear waves. These experiments performed at ultrasonic frequencies, in the range of 400-600 kHz, are complemented by time domain numerical simulations. The metasurfaces we design are not limited to guided ultrasonic waves and are a general phenomenon in elastic waves that can be translated across scales.
Issue Date: 28-Jul-2017
Date of Acceptance: 23-Jun-2017
URI: http://hdl.handle.net/10044/1/49688
DOI: https://dx.doi.org/10.1038/s41598-017-07151-6
ISSN: 2045-2322
Publisher: Nature Publishing Group
Journal / Book Title: Scientific Reports
Volume: 7
Copyright Statement: © The Author(s) 2017. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Cre- ative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not per- mitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Commission of the European Communities
The Leverhulme Trust
Funder's Grant Number: EP/L024926/1
653285
RPG-2016-365
Keywords: Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
METAMATERIAL LENS
PLATES
physics.class-ph
Publication Status: Published
Article Number: 6750
Appears in Collections:Mathematics
Applied Mathematics and Mathematical Physics
Faculty of Natural Sciences



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