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Low-index-material-based nano-slot waveguide with quasi-Bragg-reflector buffer
- Dai, D. (author)
- He, Sailing (author)
- Institution of Engineering and Technology (IET), 2008
- 2008
- English.
- In: Electronics Letters. - : Institution of Engineering and Technology (IET). - 0013-5194 .- 1350-911X. ; 44:23, s. 1554-
- Journal article (peer-reviewed)
Abstract
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- A low-index-material-based nano-slot waveguide based on a quasi-Bragg-reflector buffer is presented. This quasi-Bragg-reflector buffer includes alternating low and high refractive index dielectric layers. The thicknesses of these dielectric layers are chosen optimally by using a genetic algorithm so that the leakage loss of the present optical waveguide is minimised. An SiO2-based slot-waveguide is designed as an example and the quasi-Bragg-reflector buffer is formed by using several Si/SiO2 bilayers. The theoretical leakage loss for an SiO2-based slot-waveguide with three optimised Si/SiO2 bilayers is about 0.01 dB/mm (at 1550 nm). The modal analysis with a full-vectorial finite-difference method shows that the present slot waveguide has an enhancement of the field distribution in the nano-slot region.
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