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理论研究表明 ,在基于光子晶体的耦合腔波导中 ,杂质带的色散性质取决于相邻缺陷间局域电磁场的特性 ,而非缺陷间距离的大小 .在第一布里渊区中出现的杂质带的反常色散实际上是能带折叠的结果 .通过计算结构的有效折射率 ,证实了杂质带色散是正常色散 .
Theoretical studies have shown that the dispersion properties of the impurity bands in a photonic crystal-based coupled-cavity waveguide depend on the characteristics of local electromagnetic fields between adjacent defects, rather than the size of the distance between the defects. The presence of impurities in the first Brillouin zone The anomalous dispersion of the ribbon is actually the result of the band folding. By calculating the effective refractive index of the structure, it is confirmed that the dispersion of the impurity band is normal dispersion.