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Light pulse propagation in three-dimensional photonic crystals

机译：光脉冲在三维光子晶体中的传播

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The phase characteristics of transmitted optical pulses in three-dimensional photonic crystals were investigated in the frequency and time domain by using the spectrally resolved cross-correlation technique. The temporal evolution of femtosecond pulses passing through polystyrene colloidal crystals exhibits a large phase distortion near the stop bands. The phase discontinuity around the band gap was observed in the frequency-domain. The phase of the transmitted pulses is found to change by π across the band gap. The dispersion curve estimated from the phase shift shows good correspondence with those calculated from a photonic band calculation. The group velocity significantly slows down near the stop bands. A large change of the group velocity dispersion is also observed near the band edges. These results are in good agreement with the band theory.
机译：利用频谱分辨互相关技术，在频域和时域研究了三维光子晶体中透射光脉冲的相位特征。飞秒脉冲经过聚苯乙烯胶体晶体的时间演化在阻带附近表现出较大的相位畸变。在频域中观察到带隙周围的相位不连续性。发现发射脉冲的相位在整个带隙上变化π。从相移估计的色散曲线与从光子带计算得出的色散曲线显示出良好的对应关系。组速度在阻带附近明显减慢。在带边缘附近也观察到群速度色散的大变化。这些结果与谱带理论非常吻合。

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