On the modeling of losses in short length photonic crystal waveguides

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Abstract

The 3-D finite difference time domain (FDTD) cut-back method is used to study losses in non-disordered photonic crystal silicon membrane waveguides. Losses above the light-line have been shown to be in good agreement with other methods. Below the light-line, however, FDTD is predicting a rapid increase in losses. This paper studies the possible causes for this effect, including meshing effects, back reflections, and finite thickness sidewalls. It is found that since below the light-line the group index becomes very high and the loss becomes very low, strong Fabry-Perot oscillations dominate the cut-back results. The paper also discusses the impact of operating near to the cut-off wavelength of the photonic crystal waveguide Bloch mode and the implications this has for loss calculation.
Translated title of the contributionOn the modeling of losses in short length photonic crystal waveguides
Original languageEnglish
Pages (from-to)4841 - 4847
Number of pages7
JournalJournal of Lightwave Technology
Volume27
Issue number21
DOIs
Publication statusPublished - Nov 2009

Bibliographical note

Publisher: IEEE
Rose publication type: Journal article

Sponsorship: The author would like to thank Prof. Railton and Prof. Craddoock for their work in developing the FDTD codeused here, and Prof. J. McGeehan for the use of the Condor
computing cluster which was donated to the Department of Electrical and Electronic Engineering by Toshiba Research Labs Europe.

Terms of use: Copyright © 2009 IEEE. Reprinted from Journal of Lightwave Technology.

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Keywords

  • photonic crystals

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