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Bragg waveguide grating as a 1D photonic band gap structure: COST 268 modelling task |
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| Authors: | J ?tyroký S Helfert R Pregla P Bienstman R Baets R De Ridder R Stoffer G Klaasse J Petrá?ek P Lalanne J-P Hugonin RM De La Rue |
| Institution: | (1) Institute of Radio Engineering and Electronics, Chaberská 57, 182 51 Praha 8, Czech Republic;(2) Allgemeine und Theoretische Elektrotechnik, Fern Universität, D-58084 Hagen, Germany;(3) Department of Information Technology/IMEC, Ghent University, Sint-Pietersnieuwstraat 41, B-9000 Ghent, Belgium;(4) MESA Research Institute, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands;(5) Institute of Physical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic;(6) Institut d'Optique Théorique et Appliquée/CNRS, BP 147, 91403 Orsay Cedex, France;(7) Optoelectronics Research Group, Department of Electronics and Electrical Engineering, The University, Glasgow, G12 8QQ, Scotland, UK |
| Abstract: | Modal reflection, transmission and loss of deeply etched Bragg waveguide gratings were modelled by six European laboratories using independently developed two-dimensional (2D) numerical codes based on four different methods, with very good mutual agreement. It was found that (rather weak) material dispersion of the SiO2/Si3N4 system does not significantly affect the results. The existence of lossless Floquet–Bloch modes in deeply etched gratings was confirmed. Based on reliable numerical results, the physical origin of out-of-plane losses of 1D or 2D photonic band gap structures in slab waveguides is briefly discussed. |
| Keywords: | optical waveguide modelling photonic band gap structure photonic crystal waveguide grating |
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