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.


Published in:
Physical Review Letters, 105, -
Year:
2010
Keywords:
Laboratories:




 Record created 2011-12-16, last modified 2018-03-17


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