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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。
The properties of defect modes in one-dimensional photonic crystals containing multiple single negative material layers were analyzed. In one-dimensional photonic crystals formed by alternately stacking two kinds of single-negative (negative dielectric constant or negative permeability) materials, a plurality of single-negative material defect layers periodically arranged are incorporated to obtain a zero-effective phase in the photonic crystal There is a twin defect mode in the zero-effective phase band gap. By changing the number of defects or the thickness of the defect layer, the frequency spacing of the defect modes can be adjusted, but the number of defect modes always remains at two. The calculated results show that the frequency of the twin defect mode has a weak dependence on the incident angle. With the change of the incident angle, the relative change of the defect mode frequency always keeps below 0.03. In addition, the electric field corresponding to the mode frequency of the defect propagates strongly in the photonic crystal and is strongly localized at the interface between the defect layer and the periodic structure.