Closure of the stop-band in photonic wire Bragg gratings


Gnan, M. and Hopman, W.C.L. and Bellanca, G. and Ridder, R.M. de and 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. ISSN 1094-4087

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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.
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Copyright:© 2009 Optical Society of America
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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