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 contribution||On the modeling of losses in short length photonic crystal waveguides|
|Pages (from-to)||4841 - 4847|
|Number of pages||7|
|Journal||Journal of Lightwave Technology|
|Publication status||Published - Nov 2009|
Bibliographical notePublisher: 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.
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- photonic crystals