Imperial College London
Alternate

ProfessorRichardCraster

Faculty of Natural Sciences

Dean of the Faculty of Natural Sciences
 
 
 
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Contact

 

+44 (0)20 7594 8554r.craster Website

 
 
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Assistant

 

Miss Hannah Cline +44 (0)20 7594 1934

 
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Location

 

3.05Faculty BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Colombi:2017:10.1038/s41598-017-07151-6,
author = {Colombi, A and Ageeva, V and Smith, RJ and Clare, A and Patel, R and Clark, M and Colquitt, D and Roux, P and Guenneau, S and Craster, RV},
doi = {10.1038/s41598-017-07151-6},
journal = {Scientific Reports},
title = {Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic  metasurfaces},
url = {http://dx.doi.org/10.1038/s41598-017-07151-6},
volume = {7},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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.
AU  - Colombi,A
AU  - Ageeva,V
AU  - Smith,RJ
AU  - Clare,A
AU  - Patel,R
AU  - Clark,M
AU  - Colquitt,D
AU  - Roux,P
AU  - Guenneau,S
AU  - Craster,RV
DO  - 10.1038/s41598-017-07151-6
PY  - 2017///
SN  - 2045-2322
TI  - Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic  metasurfaces
T2  - Scientific Reports
UR  - http://dx.doi.org/10.1038/s41598-017-07151-6
UR  - https://www.nature.com/articles/s41598-017-07151-6
UR  - http://hdl.handle.net/10044/1/49688
VL  - 7
ER  -
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