Three-dimensional negative index of refraction at optical frequencies by coupling plasmonic waveguides

Details Three-dimensional negative index of refraction at optical frequencies by coupling plasmonic waveguides Three-dimensional negative index of refraction at optical frequencies by coupling plasmonic waveguides

2010-05-04

arxiv.org/abs/1005.0476v1

Physics

Optics

8 pages, 7 figures

Scientific paper

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. By properly controlling coupling between adjacent waveguides, a metamaterial consisting of a one-dimensional multilayer stack exhibiting an isotropic index of -1 can be achieved at a free-space wavelength of 400 nm. The general concepts developed here may inspire new low-loss metamaterial designs operating close to the metal plasma frequency.

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