Negative refraction and focusing of elastic Lamb waves at an interface
Name
Bramhavar-2011-Negative refraction.pdf
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640.91 KB
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Checksum (MD5)
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Author(s)
Bramhavar, Suraj
Prada, Claire
Maznev, Alexei
Every, Arthur G.
Norris, Theodore B.
Murray, Todd W.
Date Issued
January 2011
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.83.014106
