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research article
Three-Dimensional Negative Index of Refraction at Optical Frequencies by Coupling Plasmonic Waveguides
We identify a route towards achieving a negative index of refraction at optical frequencies based on coupling between plasmonic waveguides that support backwards waves. We show how modal symmetry can be exploited in metal-dielectric waveguide pairs to achieve negative refraction of both phase and energy. Control of waveguide coupling yields a metamaterial consisting of a one-dimensional multilayer stack that exhibits an isotropic index of -1 at a free-space wavelength of 400 nm. The concepts developed here may inspire new low-loss metamaterial designs operating close to the metal plasma frequency.
Type
research article
Web of Science ID
WOS:000284532900010
Authors
Publication date
2010
Published in
Volume
105
Article Number
223901
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
December 16, 2011
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