Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces
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 trappin...
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doaj-5ff0a1a9648341a58308fff37eb4d10a2020-12-08T03:08:20ZengNature Publishing GroupScientific Reports2045-23222017-07-01711910.1038/s41598-017-07151-6Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfacesAndrea Colombi0Victoria Ageeva1Richard J. Smith2Adam Clare3Rikesh Patel4Matt Clark5Daniel Colquitt6Philippe Roux7Sebastien Guenneau8Richard V. Craster9Department of Mathematics, Imperial College London, South Kensington CampusOptics and Photonics, University of NottinghamOptics and Photonics, University of NottinghamDepartment of Mechanical, Materials and Manufacturing Engineering, University of NottinghamOptics and Photonics, University of NottinghamOptics and Photonics, University of NottinghamDepartment of Mathematical Sciences, University of LiverpoolISTerre, CNRS, Univ. Grenoble AlpesAix Marseille Univ, CNRS, Centrale Marseille, Institut FresnelDepartment of Mathematics, Imperial College London, South Kensington CampusAbstract 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.https://doi.org/10.1038/s41598-017-07151-6 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Andrea Colombi Victoria Ageeva Richard J. Smith Adam Clare Rikesh Patel Matt Clark Daniel Colquitt Philippe Roux Sebastien Guenneau Richard V. Craster |
spellingShingle |
Andrea Colombi Victoria Ageeva Richard J. Smith Adam Clare Rikesh Patel Matt Clark Daniel Colquitt Philippe Roux Sebastien Guenneau Richard V. Craster Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces Scientific Reports |
author_facet |
Andrea Colombi Victoria Ageeva Richard J. Smith Adam Clare Rikesh Patel Matt Clark Daniel Colquitt Philippe Roux Sebastien Guenneau Richard V. Craster |
author_sort |
Andrea Colombi |
title |
Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces |
title_short |
Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces |
title_full |
Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces |
title_fullStr |
Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces |
title_full_unstemmed |
Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces |
title_sort |
enhanced sensing and conversion of ultrasonic rayleigh waves by elastic metasurfaces |
publisher |
Nature Publishing Group |
series |
Scientific Reports |
issn |
2045-2322 |
publishDate |
2017-07-01 |
description |
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. |
url |
https://doi.org/10.1038/s41598-017-07151-6 |
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