构造了三种慢变结构的光子晶体,利用光学传输矩阵方法对它们的光子能带特性进行了研究,发现所提出的结构能够十分有效地拓宽光子晶体的光子禁带宽度,与均匀结构相比光子禁带的拓宽率可以达到300%以上,另发现选择较小的慢变增量和较大的晶格数目是获得特宽光子禁带区的关键。

Three kinds of photonic crystals with slowly varying lattices are investigated using optical transmission matrix method. It is found that the photonic bandgaps region are enlarged by 3 times as compared with that of ordinary photonic crystals with uniform lattices. The key to obtain large photonic bandgaps in such structures is to vary the lattices very slowly and to have large number of lattices in the structure.