Confinement and guiding of two-dimensional optical waves by low-refractive-index cores

A new method for confining and guiding two-dimensional (2D) optical waves is proposed using low-refractive-index materials as cores of metal-gap waveguides. A proper choice of the refractive index of claddings prohibits 2D optical waves from propagating inside the claddings, resulting in strong conf...

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Published inOptics express Vol. 14; no. 12; pp. 5651 - 5656
Main Authors Kusunoki, F, Yotsuya, T, Takahara, J
Format Journal Article
LanguageEnglish
Published United States 12.06.2006
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Summary:A new method for confining and guiding two-dimensional (2D) optical waves is proposed using low-refractive-index materials as cores of metal-gap waveguides. A proper choice of the refractive index of claddings prohibits 2D optical waves from propagating inside the claddings, resulting in strong confinement of waves inside the low-refractive-index cores. We numerically demonstrate that this new method for guiding 2D optical waves can achieve stronger confinement than the conventional one using high-refractive-index cores. This strong confinement leads to efficient guiding of 2D optical waves not only at straight path, but also at sharp 90 degrees bends with negligible radiation losses.
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ISSN:1094-4087
1094-4087
DOI:10.1364/oe.14.005651