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Negative refraction and focusing of elastic Lamb waves at an interface

Author(s)
Bramhavar, Suraj; Prada, Claire; Maznev, Alexei; Every, Arthur G.; Norris, Theodore B.; Murray, Todd W.; ... Show more Show less
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Abstract
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.
Date issued
2011-01
URI
http://hdl.handle.net/1721.1/63805
Department
Massachusetts Institute of Technology. Department of Chemistry
Journal
Physical Review B
Publisher
American Physical Society
Citation
Bramhavar, Suraj et al. "Negative refraction and focusing of elastic Lamb waves at an interface." Phys. Rev. B 83, 014106 (2011)© 2011 American Physical Society.
Version: Final published version
ISSN
1098-0121
1550-235X

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