Closure of the stop-band in photonic wire Bragg gratings

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Gnan, M. and Hopman, W.C.L. and Bellanca, G. and Ridder de, R.M. 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.
Item Type:Article
Copyright:© 2009 Optical Society of America
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/67797
Official URL:http://dx.doi.org/10.1364/OE.17.008830
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