非线性负折射率材料表面TE电磁波的空间稳定特性分析

Stability of TE electromagnetic waves at the interface of a nonlinear negative refraction material

针对电磁波在正负非线性材料界面处的传播,研究了两种稳定状态下电磁波的物理特性。理论分析和数值计算表明,该界面处电磁波的传播存在着频率通带,且带宽仅与两种材料的固有属性有关。得出前向表面波和后向表面波均可以在这种非线性导波系统中传播,并且在一定条件下,随着频率的变化,前向表面波和后向表面波可以在两种材料中跃变。推论出两种稳定传播的电磁波场峰值位置随传播功率的变化也能实现在两种材料中跃变,并逐渐向界面靠近,而传播功率较大的稳定态电场峰值几乎靠着界面。

For TE electromagnetic waves propagating at the interface of a conventional nonlinear material and a negative refraction material, the properties are investigated in detail. The results prove that there exist pass bands, which have the material-dependent properties. Base on the analysis, the interface supports both forward and backward TE surface waves which can change each other under certain conditions. The electric field amplitude in the two materials is also studied. It＇s found that the two amplitudes can change from one material to the other with the difference of energy flux. Both of the two amplitudes are near the interface, one is almost at the interface.