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构造了变迹和啁啾的光子晶体结构,用时域有限差分(FDTD)法分析了它们的响应特性。分别对不同啁啾系数的光子晶体结构和不同变迹形式的光子晶体结构进行了比较分析。研究表明,啁啾结构的光子晶体与普通结构的光子晶体相比,禁带的带宽增加了,禁带的中心频率向低频处偏移,当啁啾系数在0~0.01之间以0.002变化率增加时,随着啁啾系数增大,禁带的宽度变大,禁带的中心频率减小;同样构造的线性变迹的光子晶体和正弦变迹的光子晶体对于光子禁带的中心频率和宽度有类似的影响。
The apodized and chirped photonic crystal structures were constructed, and their response characteristics were analyzed by FDTD method. The photonic crystal structures with different chirp coefficients and different apodized photonic crystal structures were compared and analyzed respectively. The results show that the bandgap of photonic crystal with chirp structure is increased compared with photonic crystal with ordinary structure, and the center frequency of band gap is shifted to low frequency. When the chirp coefficient is between 0 and 0.01 with a rate of 0.002 As the chirp coefficient increases, the width of the forbidden band becomes larger and the center frequency of the forbidden band decreases. Similarly, the linear apodized photonic crystals and the sinusoidal apodized photonic crystals have no significant effect on the central frequencies of photonic band gaps Width has a similar effect.