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Bragg waveguide grating as a 1d photonic band gap structure: COST 268 modelling task |
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| Authors: | J. Čtyroký S. Helfert R. Pregla P. Bienstman R. Baets R. De Ridder R. Stoffer G. Klaasse J. PetráČek P. Lalanne J. P. Hugonin R. M. De LaRue |
| Affiliation: | 1. Institute of Radio Engineering and Electronics, Chaberská 57, 182 51, Praha 8, Czech Republic 2. Allgemeine und Theoretische Elektrotechnik, FernUniversit?t, 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, Netherlands 5. Institute of Physical Engineering, Brno University of Technology, Technicka 2, 616 69, Brno, Czech Republic 6. Institut d’Optique Theorique et Appliquee/CNRS, BP 147, 91403, Orsay Cedex, France 7. Optoelectronics Research Group, Department of Electronics and Electrical Engineering, The University, G12 8QQ, Glasgow, 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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