论文部分内容阅读
利用平面波展开方法研究了两种二维磁性光子晶体(MPC)的带隙(PBG)结构,一种磁性光子晶体是在长方格子纯电介质背景上放置磁性介质长方形散射子,另一种是在三角形格子纯电介质背景上放置磁性介质圆形散射子。计算了这两种磁性光子晶体的带隙随磁导率的变化规律,发现这两种磁性光子晶体的带隙宽高比(带隙宽与带隙中心位置比)都比较大。在此基础上由这两种磁性光子晶体构成了磁性光子晶体异质结(MRRTC异质结),并利用超原胞方法计算了这种异质结的带隙结构。研究发现MRRTC异质结无需从界面做晶格拉开或者侧向滑移就可在绝对带隙中产生界面传导模。分别从MRRTC异质结的界面处做晶格拉开和侧向滑移,发现传导模位置及形状发生了很大变化。
The bandgap (PBG) structures of two kinds of two-dimensional magnetic photonic crystals (MPC) are studied by the plane wave expansion method. One kind of magnetic photonic crystal is a rectangular scattering element placed on a rectangular grid pure dielectric background, Triangular Lattice Placement of magnetic media round scatterers on purely dielectric background. The band gap of these two kinds of magnetic photonic crystals was calculated with the change of permeability. It was found that the bandgap ratio (band gap width to bandgap center position) of the two kinds of magnetic photonic crystals was relatively large. On this basis, magnetic photonic crystal heterojunction (MRRTC heterojunction) is formed by these two kinds of magnetic photonic crystals, and the band gap structure of the heterojunction is calculated by the method of superanto cell. It has been found that the MRRTC heterojunction can generate interface conduction modes in the absolute bandgap without the lattice pull-out or lateral slip from the interface. From the interface of MRRTC heterojunction respectively, the crystal lattices and lateral slip were found, and the position and shape of the conduction mode were greatly changed.