多个单负材料缺陷一维光子晶体的孪生缺陷模

分析了含有多个单负材料缺陷层的一维光子晶体中缺陷模的性质。在两种单负(负介电常量或负磁导率)材料交替堆叠形成的一维光子晶体中,掺入了多个周期排列的单负材料缺陷层,得到在该光子晶体的零有效相位(zero-effective phase)带隙内存在孪生缺陷模。通过改变缺陷的数目或缺陷层的厚度,可调节缺陷模的频率间隔,但缺陷模的数目总保持为两个。计算结果显示,该孪生缺陷模的频率对入射角度的依赖较弱;随着入射角度的改变,缺陷模频率的相对改变量总保持在0.03以下。此外,对应缺陷模频率的电场在该光子晶体中传播时,将被强烈地局域在缺陷层与周期结构的交界面上。

Twin Defect Modes in One-Dimensional Photonic Crystals with Defect Layers of Multiple Single-Negative-Materials

The defect modes in one-dimensional photonic crystals containing defect layers of multiple single-negative materials are analyzed.The photonic crytals are stacked alternately with single-negative-permittvity and single-negative-permeability media with periodic defect layers.Twin defect modes are found inside the photonic gap with zero effective phase.By varying the defect number or the thicknesses of the defect layers,the frequency interval of the defect modes can be changed,but the number of the defect modes remains two.The two defect modes inside the zero-effective-phase gap are insensitive to incident angle;the normalized frequency shift of the defect modes is always less than 0.03 as the incident angle varies.Moveover,the electric fields at the frequencies of the defect modes are strongly localized at the interfaces between defect layers and periodic structures.