Open AccessTuning of zero group velocity dispersion in infiltrated vertical silicon slot waveguides
Author(s) -
Peter W. Nolte,
Christian Bohley,
Jörg Schilling
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.001741
Subject(s) - optics , waveguide , refractive index , dispersion (optics) , group velocity , materials science , self phase modulation , figure of merit , slot waveguide , nonlinear optics , chalcogenide , physics , silicon photonics , optoelectronics , photonics , laser
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.