左手系材料界面上的非线性TE电磁波

Nonlinear TE Surface Waves at the Interface of a Left-handed Material

针对电磁波在非线性左手系材料中的传播性质,分别研究了左、右手系材料界面以及两左手系材料界面上非线性TE表面波的传播行为·讨论了导波的频率特性、色散关系以及群速度随频率的变化规律·分析表明,两种界面上的非线性TE表面波均存在频率通带和禁带,且带宽是传播功率的函数·揭示了在一定条件下,左、右手系材料界面上既可以支持正向传播的非线性TE表面波,也可以支持反向传播的非线性TE表面波;两左手系材料界面上表面波的传播性质因材料参量的变化差异较大,一定参量条件下,该界面上仅支持反向传播的非线性TE表面波·

For electromagnetic plane wave propagating in nonlinear left-handed material, the properties of nonlinear TE surface waves localized at the interface of a left-handed material （an interface separating a left handed material and a right-handed material or an interface separating two left-handed materials） are investigated in detail. The results of frequency characteristics prove there exist both passband（s） and stopband（s）, which have the wave power-dependent properties and can be controlled by varying the power in the waveguide. The frequency dispersion and variation of group velocity with frequency are also calculated. Base on the analysis, the interface between a nonlinear left-handed material and a right-handed material can support both forward TE surface waves and backward TE surface waves under certain conditions. Whereas, the relative properties are quite different when the surface waves localize at the interface between two left handed materials, there only can exist backward waves according to certain conditions.