基于负折射率材料一维光子晶体可调节的频率和方向滤波器

为实现可调节的频率和方向滤波器,设计基于负折射率材料含空气层缺陷的一维光子晶体.用特征矩阵的方法研究电磁波在此种结构中的透射系数.研究发现在零平均折射率带隙内存在缺陷模,在正入射条件下缺陷模位置通过改变空气层厚度来调节.对在零平均折射率带隙内某个频率的电磁波,有某个特定方向让其透射,该方向也可以通过改变空气层厚度来调节.研究结果为设计可调节的频率和方向滤波器提供了理论依据.

Tunable Frequency Filter and Directional Filter Based on One-dimensional Photonic Crystals Containing Negative Refraction Materials

Tunable frequency filter and directional filter based on one-dimensional photonic crystals containing negative refraction materials were designed.With an air defect inside the one-dimensional photonic crystals,the transmittance of the one-dimensional photonic crystals was calculated through eigen matrix method.The frequency position of defect mode within the zero-average index gap can be changed through adjusting the thickness of air layer.For one frequency within the zero-average index gap,there is an inci...