Abstract

The strength of the nonlinear optical effects in silicon–nanocrystal waveguides can be varied as required for applications by altering the geometry of the waveguide and the composition of its nonlinear core. By studying theoretically the geometric and composition dependencies of the mode overlap factors responsible for the nonlinear interaction between the pump and Stokes optical fields, which are separated by the Raman shift in silicon, we demonstrate that this strength can be varied in a wide range, thus offering broad opportunities for engineering optical nonlinearities in silicon–nanocrystal waveguides. The numerically calculated mode overlap factors are useful in modeling light propagation through nonlinear silicon–nanocrystal waveguides governed by the recently derived generalized nonlinear Schrödinger equations.

© 2013 Optical Society of America

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