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Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces

Colombi, Andrea; Ageeva, Victoria; Smith, Richard J.; Clare, Adam T.; Patel, Rikesh; Clark, Matt; Colquitt, Daniel; Roux, Philippe; Guenneau, Sebastien; Craster, Richard V.

Authors

Andrea Colombi

Victoria Ageeva v.ageeva@sheffield.ac.uk

RICHARD SMITH richard.j.smith@nottingham.ac.uk
Assistant Professor in Optical and Electronic Engineering

ADAM CLARE adam.clare@nottingham.ac.uk
Professor of Manufacturing Engineering

MATT CLARK matt.clark@nottingham.ac.uk
Professor of Applied Optics

Daniel Colquitt

Philippe Roux

Sebastien Guenneau

Richard V. Craster



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.

Journal Article Type Article
Publication Date 2017-12
Journal Scientific Reports
Print ISSN 2045-2322
Electronic ISSN 2045-2322
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 7
Issue 1
Article Number 6750
APA6 Citation Colombi, A., Ageeva, V., Smith, R. J., Clare, A. T., Patel, R., Clark, M., …Craster, R. V. (2017). Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces. Scientific Reports, 7(1), https://doi.org/10.1038/s41598-017-07151-6
DOI https://doi.org/10.1038/s41598-017-07151-6
Publisher URL https://www.nature.com/articles/s41598-017-07151-6
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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