Negative refraction of elastic waves in 2D phononic crystals : contribution of resonant transmissions to the construction of the image of a point source
Résumé
Negative refraction properties of a two-dimensional phononic crystal (PC), made of a triangular lattice of steel rods embedded in epoxy are investigated both experimentally and numerically. First, experiments have been carried out on a prism shaped PC
immersed in water. Then, for focusing purposes, a flat lens is considered and the construction of the image of a point source is analyzed in details, when indices are matched between the PC and the surrounding fluid medium, whereas acoustic
impedances are mismatched. Optimal conditions for focusing longitudinal elastic waves by such PC flat lens are then discussed
Domaines
Acoustique [physics.class-ph]
Origine : Publication financée par une institution
Licence : CC BY - Paternité
Licence : CC BY - Paternité