Closure of the stop-band in photonic wire Bragg gratings

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
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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