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  • Title: Tuning of zero group velocity dispersion in infiltrated vertical silicon slot waveguides.
    Author: Nolte PW, Bohley C, Schilling J.
    Journal: Opt Express; 2013 Jan 28; 21(2):1741-50. PubMed ID: 23389158.
    Abstract:
    In this work the design of Si / hybrid waveguides which contain a vertical infiltrated slot is studied. The case of slots infiltrated with a χ³ nonlinear material of relatively high refractive index (e.g. chalcogenide glasses) is specifically discussed. An optimized waveguide geometry with periodic refractive index modulation, a nonlinear figure of merit > 1 and minimum effective mode cross section is presented. Introducing a periodic refractive index variation along the waveguide allows the adjustment of the group velocity dispersion (GVD). Choosing the period accordingly, the phase matching condition for degenerate four wave mixing (GVD = 0) can be fulfilled at virtually any desired frequency and independently from the fixed optimized waveguide cross section.
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