فهرست نشریات علمی دسترسی آزاد ایران

In this paper, propagation of ultrashort femtosecond pulses in a Kerr-type nonlinear photonic crystal microresonator is modeled using the finite-difference time-domain (FDTD) method. Unlike conventional mean-field models, this approach solves Maxwell’s equations in full-wave form without slowly varying envelope approximations (SVEA). Results show that in the sub-100 fs regime, phenomena such as spatial energy localization with a maximum ratio of , dynamic hot spots with a spatial full-width at half-maximum (FWHM) of 120 nm, and transient oscillations at 15 THz with amplitude modulation up to 40% occur. The mean-field model underestimates the resonance build-up time by and overestimates the peak energy by . Spectral analysis reveals a red shift of up to nm at hot spots for a peak intensity of 50 GW/cm². These results are applicable to the design of ultrafast all-optical switches with sub-100 fs response time and high-sampling-rate all-optical analog-to-digital converters