Observation of pulse-phase shift in a highly-nonlinear slotted photonic crystal waveguide

A silicon nanocrystal embedded Nonlinear Slotted Photonic Crystal Waveguide (NSPhCW) is proposed to reduce the length of the nonlinear section required in a typical all-optical switching device. Phase-variation of a pulse due to the effect of self-phase modulation and cross-phase modulation has been calculated and analysed under slow-light regime using a modified Nonlinear Schrodinger Equation (NSEs). A 180-degree phase shift is observed in a sub-hundred micrometer length of the NSPhCW even without the effect of XPM. Also, the addition of a control signal increases the change in phase shift more drastically and a same phase shift is attained in a smaller length.