@article{Dubois:2019:10.1103/PhysRevB.99.100301,
author = {Dubois, M and Perchoux, J and Vanel, AL and Tronche, C and Achaoui, Y and Dupont, G and Bertling, K and Rakic, AD and Antonakakis, T and Enoch, S and Abdeddaim, R and Craster, RV and Guenneau, S},
doi = {10.1103/PhysRevB.99.100301},
journal = {Physical Review B: Condensed Matter and Materials Physics},
title = {Acoustic flat lensing using an indefinite medium},
url = {http://dx.doi.org/10.1103/PhysRevB.99.100301},
volume = {99},
year = {2019}
}

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TY  - JOUR
AB  - Acoustic flat lensing is achieved here by tuning a phononic array to have indefinite medium behavior in a narrow frequency spectral region along the acoustic branch in the irreducible Brillouin zone (IBZ). This is confirmed by the occurrence of a flat band along an unusual path in the IBZ and by interpreting the intersection point of isofrequency contours on the corresponding isofrequency surface; coherent directive collimated beams are formed whose reflection from the array surfaces create lensing. Theoretical predictions using a mass-spring lattice approximation of the phononic crystal (PC) are corroborated by time-domain experiments, airborne acoustic waves generated by a source with a frequency centered about 10.6 kHz, placed at three different distances from one side of a finite PC slab, constructed from polymeric spheres, yielding distinctive focal spots on the other side. These experiments evaluate the pressure field using optical feedback interferometry and demonstrate precise control of the three-dimensional wave trajectory through a sonic crystal.
AU  - Dubois,M
AU  - Perchoux,J
AU  - Vanel,AL
AU  - Tronche,C
AU  - Achaoui,Y
AU  - Dupont,G
AU  - Bertling,K
AU  - Rakic,AD
AU  - Antonakakis,T
AU  - Enoch,S
AU  - Abdeddaim,R
AU  - Craster,RV
AU  - Guenneau,S
DO  - 10.1103/PhysRevB.99.100301
PY  - 2019///
SN  - 1098-0121
TI  - Acoustic flat lensing using an indefinite medium
T2  - Physical Review B: Condensed Matter and Materials Physics
UR  - http://dx.doi.org/10.1103/PhysRevB.99.100301
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000461052900001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/75096
VL  - 99
ER  - 

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