Propagation of femtosecond optical pulses in threedimensionalphotonic crystal

摘要

The phase characteristics of transmitted optical pulses in threedimensionalphotonic crystals were investigated in the frequency and timedomain by using the spectrally resolved cross-correlation technique. Thetemporal evolution of femtosecond pulses passing through polystyrenecolloidal crystals exhibits a large phase distortion near the stop bands. Thephase of the transmitted pulses is found to change by π across the bandgap. The dispersion curve estimated from the phase shift shows goodcorrespondence with those calculated from a photonic band calculation.