Raman Stokes/Anti-Stokes Wavelength Conversion in "Automatically" Quasi-Phase-Matched Silicon Microdisk Resonators

In this paper, we numerically demonstrate the promise of silicon microdisks for Raman Stokes/anti-Stokes wavelength conversion. We design a silicon microdisk suitable for Raman wavelength conversion with "automatic" quasi-phase matching (QPM). By carefully designing the bus waveguide adjacent to the disk, we show that, for each wavelength involved in the nonlinear process, we can excite the proper light mode for which the "automatic" QPM concept is obtained in the microdisk, and find that with this design, we can achieve wavelength conversion efficiencies up to -2.4 dB at input pump powers as low as 3.4 mW.