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Analysis of a line-defect waveguide on a silicon-on-insulator two-dimensional photonic-Crystal slab

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4 Author(s)
Tanaka, Y. ; Dept. of Electron. Sci. & Eng., Kyoto Univ., Japan ; Asano, T. ; Hatsuta, Ranko ; Noda, S.

This paper describes the investigation of the waveguide properties of a silicon-on-insulator (SOI)-based two-dimensional photonic-crystal slab. It is found that coupling between transverse-electric (TE)-like defect modes and transverse-magnetic (TM)-like slab modes occurs in some frequency range due to structural asymmetries in the vertical direction. This TE-TM coupling, together with the smaller refractive-index contrast between the slab and dielectric cladding, results in propagation losses for a line-defect waveguide in an SOI structure. The paper also presents optimization methods for obtaining a wide lossless propagation band using such a line defect.

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Lightwave Technology, Journal of  (Volume:22 ,  Issue: 12 )