Gnan, M., Hopman, W.C.L., Bellanca, G., de Ridder, R.M., De La Rue, R.M. and Bassi, P. (2009) Closure of the stop-band in photonic wire Bragg gratings. Optics Express, 17(11), pp. 8830-8842. (doi: 10.1364/OE.17.008830)
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Abstract
Photonic Wire Bragg Gratings, made by periodic insertion of lateral rectangular recesses into photonic wires in silicon-on-insulator, can provide large reflectivity with short device lengths because of their large index contrast. This type of design shows a counter-intuitive behaviour, as we demonstrate - using experimental and numerical data - that it can have low or null reflectance, even for large indentation values. We provide physical insight into this phenomenon by developing a model based on Bloch mode theory, and are able to find an analytical expression for the frequency at which the grating does not sustain the stop-band. Finally we demonstrate that the stop-band closing effect is a general phenomenon that may occur in various types of periodic device that can be modeled as transmission line structures.
Item Type: | Articles |
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Keywords: | behaviour Bragg grating BRAGG GRATINGS CRYSTALS Design device expression FREQUENCIES frequency gratings light model optical reflectivity silicon silicon-on-insulator soi transmission wave-guides |
Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | De La Rue, Professor Richard |
Authors: | Gnan, M., Hopman, W.C.L., Bellanca, G., de Ridder, R.M., De La Rue, R.M., and Bassi, P. |
College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
Journal Name: | Optics Express |
Publisher: | Optical Society of America |
ISSN: | 1094-4087 |
ISSN (Online): | 1094-4087 |
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