Negative index and indefinite media waveguide couplers |
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Authors: | A Degiron DR Smith JJ Mock BJ Justice and J Gollub |
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Institution: | (1) Department of Electrical and Computer Engineering, Duke University, Box 90291, Durham, NC 27708, USA |
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Abstract: | We study the coupling interaction between dielectric waveguides and coupling elements made from negative-refracting media.
The coupling configuration consists of a length of dielectric waveguide, which terminates either directly into or near a planar
layer composed of the negative-refracting medium, and is followed by a second waveguide. Radiation output from the first waveguide
is refocused at the position of the second waveguide, so that the negative-refracting layer serves as a coupler between the
waveguides. Because both isotropic negative-index layers and bilayers of indefinite media can recover the near-field, evanescent
components of a source field distribution, the coupling between the input and output waveguides can be highly efficient –
in principle providing perfect, lossless coupling. We present simulations and some initial experimental results illustrating
the coupling effect, and speculate on the potential for optical fiber couplers and integrated modulators.
PACS 42.79.Gn; 41.20.-q; 42.70.-a |
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Keywords: | |
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