Imaging an off-plane shear wave source with two-dimensional phononic-crystal lens
Abstract
A two dimensional flat phononic crystal (PC) lens for focusing off-plane shear waves is proposed. The lens consists of a triangular lattice hole-array, embedded in solid matrix. Self-collimation effect is employed to guide the shear waves propagating through the lens along specific directions. Dirichlet-to-Neumann Maps (DtN) method is employed to calculate the band structure of the PC, which can avoid the problems of bad convergence and fake bands automatically in the void-solid PC structure. When the lens is illuminated by the off-plane shear waves emanating from a point source, a subwavelength image appears in the far-field zone. The imaging characteristics are investigated by calculating the displacement fields explicitly using the multiple-scattering method, and the results are in good agreement with the ray-trace predictions. Our results may provide insights for designing new phononic devices.
Cite
@article{arxiv.1001.0246,
title = {Imaging an off-plane shear wave source with two-dimensional phononic-crystal lens},
author = {Chen-Yu Chiang and Pi-Gang Luan},
journal= {arXiv preprint arXiv:1001.0246},
year = {2015}
}
Comments
15 pages, 6 figures. To appear in J. Phys. Cond. Matt. (2010)