BibTex format

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 = {},
volume = {118},
year = {2017}

RIS format (EndNote, RefMan)

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 -
UR -
UR -
VL - 118
ER -