含左手材料的四层平面波导TM模的传输特性  

Propagation Properties of TM-guided Modes in a Four-layer Slab Waveguide Including Left-handed Materials

作　　者：沈陆发[1] 王子华[2] 

机构地区：[1]湖州师范学院理学院,浙江湖州313000 [2]上海大学通信与信息工程学院,上海200072

出　　处：《半导体光电》2010年第2期180-184,共5页Semiconductor Optoelectronics

基　　金：国家"973"计划资助项目(2004CB719800)

摘　　要：在考虑材料色散的条件下,对含左手材料的四层平面波导的TM振荡模进行了分析。首先利用Maxwell方程组得到了两类TM振荡模的色散方程。基于左手材料实验模型,画出了相关的色散曲线。通过对这些色散曲线的分析,得到了该波导中TM振荡模的色散特性。此外,还计算了该波导中TM振荡模的归一化功率流,发现第一类TM基模的群速和它的归一化功率流方向相反;第一类TM振荡模的归一化功率流恒大于零;而第二类TM振荡模的归一化功率流可以大于零、小于零或等于零。正的归一化功率流则说明能量向前传输;负的归一化功率流则说明能量向后传输;而归一化功率流等于零则说明能量被储存在平面波导中,这为设计新型光开关、光传感器件提供了理论基础。Considering the material dispersion, TM guided modes in a four-layer slab waveguide including left-handed material are investigated. Firstly, two types of dispersion equations are obtained for TM guided modes through Maxwell′s equations. In terms of these equations, based on experimental model, the corresponding dispersion curves are plotted, respectively. Then, these curves are analyzed and some new dispersive properties of TM guided modes are found. Besides, the normalized power fluxes of TM guided modes in the waveguide is calculated, and it is found that： for the first type of fundamental mode, the direction of group velocity is opposite to that of the normalized power flux; and the normalized power fluxes for the first type are always positive, however, for the second type, the fluxes may be positive, negative, or zero in different frequency regions. The positive normalized power flux implies the energy travels forward and the negative one means the energy moves back. As the normalized power flux equals zero, it tells that all energy is stored in the slab waveguide. This may provide us a theory foundation for designing new optical switches and sensors.

关 键 词：平面波导 左手材料 色散特性 归一化功率流 

分 类 号：TN252[电子电信—物理电子学]