含负折射率材料1维光子晶体的偏振无关非全向的缺陷模

运用光学传输矩阵理论,研究了含负折射率材料1维光子晶体缺陷模的偏振特性。结果显示,零均折射率带隙中缺陷模对入射角和偏振有较强的依赖。通过对缺陷层参数的优化设计,得到了一系列的偏振无关非全向缺陷模,这是传统1维光子晶体中不能出现的。应用这些缺陷模,设计了低通、高通、带通空间滤波器。与传统光子晶体空间滤波器相比,这些空间滤波器具有偏振无关的优点。

Polarization-independent and non-omnidirectional defect modes of one-dimensional photonic crystals with negative-index materials

Polarization properties of defect modes of one-dimensional photonic crystals with negative-index materials are investigated by optical transfer matrix method. It is found that the defect modes in the zero-average-index gap have a strong dependence on the incident angles and polarization. Through tuning the optimized parameters of the defect layer, a series of polarization-independent and non-omnidirectional defect modes is obtained with the increase of incident angle, which is not available in conventional one-dimensional photonic crystals. Based on these defect modes, we have designed low-, high- and band pass spatial filters which have a polarization-independent feature comparing with spatial filters of conventional photonic crystals.