Negative refraction and focusing of elastic Lamb waves at an interface

被引：72

作者：

Bramhavar, Suraj ^{[1
]}

Prada, Claire ^{[2
]}

Maznev, Alexei A. ^{[3
]}

Every, Arthur G. ^{[4
]}

Norris, Theodore B. ^{[5
]}

Murray, Todd W. ^{[6
]}

机构：

[1] Boston Univ, Dept Elect & Comp Engn, Boston, MA 02215 USA

[2] ESPCI ParisTech, Inst Langevin, CNRS, UMR 7587, F-75231 Paris 05, France

[3] MIT, Dept Chem, Cambridge, MA 02139 USA

[4] Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa

[5] Univ Michigan, Ctr Ultrafast Opt Sci, Ann Arbor, MI 48109 USA

[6] Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 01期

基金：

美国国家科学基金会;

关键词：

GROUP-VELOCITY; PHOTONIC CRYSTALS; INDEX MATERIALS; PLATES; PROPAGATION; MODES;

D O I：

10.1103/PhysRevB.83.014106

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study negative refraction and focusing of elastic waves in a simple mechanical system comprised of a freestanding plate with a step change in thickness. A point-focused and intensity-modulated laser source is used to excite backward-propagating Lamb waves on one side of the step, and the displacement field is probed using an optical interferometer. Conversion between forward- and backward-propagating modes at the interface leads to negative refraction, and we demonstrate for the first time the operation of a flat lens, similar to that predicted by Veselago in negative-index media, for guided elastic waves in isotropic media. We propose that guided elastic waves provide a convenient and powerful experimental test bed for the study of negative-index physics.

引用

页数：5

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