Closure of the stop-band in photonic wire Bragg gratings

M. Gnan, W.C.L. Hopman, G. Bellanca, R.M. de Ridder, R.M. De La Rue, P. Bassi

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    21 Citations (Scopus)
    145 Downloads (Pure)


    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.
    Original languageEnglish
    Pages (from-to)8830-8842
    Number of pages13
    JournalOptics express
    Issue number11
    Publication statusPublished - 12 May 2009




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