Surface corrugated laminates as elastic grating couplers: Splitting of SV- and P-waves by selective diffraction

被引:1
作者
Chaplain, G. J. [1 ]
Craster, R. V. [1 ,2 ,3 ]
机构
[1] Imperial Coll London, Dept Math, London SW7 2AZ, England
[2] Imperial Coll London, Dept Mech Engn, London SW7 2AZ, England
[3] Imperial Coll London, UMI 2004 Abraham de Moivre CNRS, London SW7 2AZ, England
基金
英国工程与自然科学研究理事会; 欧盟地平线“2020”;
关键词
PROPAGATION; REFRACTION;
D O I
10.1063/5.0037804
中图分类号
O59 [应用物理学];
学科分类号
摘要
The phenomenon of selective diffraction is extended to in-plane elastic waves, and we design surface corrugated periodic laminates that incorporate crystal momentum transfer, which, due to the rich physics embedded within the vector elastic system, results in frequency, angle, and wave-type selective diffraction. The resulting devices are elastic grating couplers, with additional capabilities as compared to analogous scalar electromagnetic couplers, in that the elastic couplers possess the ability to split and independently redirect, through selective negative refraction, the two body waves present in the vector elastic system: P- (compressional) and SV- (shear-vertical) elastic waves. The design paradigm, and interpretation, is aided by obtaining isofrequency contours via a non-dimensionalized transfer matrix method.
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页数:10
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