Phase matching for efficient nonlinear frequency generation in hybrid Si/chalcogenide glass slot waveguides

摘要

m/W [2]), leading to a small figure of merit (FOMSi = n2/λβ ≈ 0.6 at λ = 1550 nm). Generally a FOM > 1 is necessary for efficient nonlinear optical processes [3]. One way to enhance the performance of SOI based devices is to combine Si with a material showing a higher FOM such as organic materials [4], chalcogenide glasses, e.g. As2S3[5] or silicon nano crystals [6]. For nonlinear optical frequency transformation (e.g. second harmonic generation, four wave mixing) the phase matching is crucial, as well. Controlling the waveguide dispersion is, therefore, essential in designing devices using these processes.