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{Lefebvre:2017:10.1103/PhysRevLett.118.254302,
author = {Lefebvre, G and Antonakakis, T and Achaoui, Y and Craster, RV and Guenneau, S and Sebbah, P},
doi = {10.1103/PhysRevLett.118.254302},
journal = {Physical Review Letters},
title = {Unveiling extreme anisotropy in elastic structured media},
url = {http://dx.doi.org/10.1103/PhysRevLett.118.254302},
volume = {118},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Periodic structures can be engineered to exhibit unique properties observed at symmetry points, such as zero group velocity, Dirac cones, and saddle points; identifying these and the nature of the associated modes from a direct reading of the dispersion surfaces is not straightforward, especially in three dimensions or at high frequencies when several dispersion surfaces fold back in the Brillouin zone. A recently proposed asymptotic high-frequency homogenization theory is applied to a challenging time-domain experiment with elastic waves in a pinned metallic plate. The prediction of a narrow high-frequency spectral region where the effective medium tensor dramatically switches from positive definite to indefinite is confirmed experimentally; a small frequency shift of the pulse carrier results in two distinct types of highly anisotropic modes. The underlying effective equation mirrors this behavior with a change in form from elliptic to hyperbolic exemplifying the high degree of wave control available and the importance of a simple and effective predictive model.
AU  - Lefebvre,G
AU  - Antonakakis,T
AU  - Achaoui,Y
AU  - Craster,RV
AU  - Guenneau,S
AU  - Sebbah,P
DO  - 10.1103/PhysRevLett.118.254302
PY  - 2017///
SN  - 0031-9007
TI  - Unveiling extreme anisotropy in elastic structured media
T2  - Physical Review Letters
UR  - http://dx.doi.org/10.1103/PhysRevLett.118.254302
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000403719100006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/50197
VL  - 118
ER  -
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