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arXiv · 1001.0246

Imaging an off-plane shear wave source with two-dimensional phononic-crystal lens

Chen-Yu Chiang·Pi-Gang Luan
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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.

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Chen-Yu Chiang, Pi-Gang Luan. 2010-01-02. Imaging an off-plane shear wave source with two-dimensional phononic-crystal lens. https://doi.org/10.1088/0953-8984%2F22%2F5%2F055405

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