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应用传输矩阵方法推导了光脉冲在一维光子晶体中的动力演化.若在结构中引入非色散的缺陷时,超光速传播将变成慢光速;若引入含二能级原子色散缺陷时,慢光速又将变成超光速.最后指出,尽管群速度比真空中光速c大,甚至为负,但能量传播速度一定不会超过光速c,光脉冲在光子晶体中的此种现象是布喇格反射波相干叠加的结果.
The propagation of light pulses in a one-dimensional photonic crystal is deduced using the transfer matrix method. If non-dispersive defects are introduced into the structure, the propagation of the superluminal light will be slowed down. If two-level atomic dispersion defects are introduced, The speed of light will turn into superluminal velocity again.Finally, it is pointed out that although the group velocity is larger or even negative than the velocity of light in vacuum, the velocity of energy transmission will not exceed the speed of light c. The phenomenon of light pulse in photonic crystal is Bragg The result of coherent superposition of reflected waves.