Imaging off-plane shear waves with a two-dimensional phononic crystal lens

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50942

Title:	Imaging off-plane shear waves with a two-dimensional phononic crystal lens
Authors:	Chiang,CY;Luan,PG
Contributors:	光電科學研究所
Date:	2010
Issue Date:	2012-03-27 18:13:23 (UTC+8)
Publisher:	國立中央大學
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 a solid matrix. The self-collimation effect is employed to guide the shear waves propagating through the lens along specific directions. The 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.
Relation:	JOURNAL OF PHYSICS-CONDENSED MATTER
Appears in Collections:	[Graduate Institute of Optics and Photonics] journal & Dissertation

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