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对于晶体光轴平行于波导界面的结构 ,讨论了光在金属包层对称平面单轴晶体波导 (波导层是单轴晶体 ,两个波导界面均为金属 )内的传输特性 .解析地得到了这种结构下波导模式场的精确解 .模式场的性质因单轴晶体的性质不同而异 .对于正单轴晶体 ,波导的主模是横电波 ,任何频率的光波均可激励该模式 ;当频率满足一定条件时 ,波导内传输单模 ,否则 ,将激励起高阶模式 .高阶模既非TE波 ,也非TM波 ,而是两者耦合而成的混合模 .对于负单轴晶体 ,波导的主模是一种混合模 ,该模式同样可被任何频率的光波所激励 ;当频率满足一定条件时 ,波导内传输单模 ,否则 ,将激励起高阶混合模
For the structure that the optical axis of the crystal is parallel to the interface of the waveguide, the propagation characteristics of the light in the symmetry plane uniaxial crystal cladding (the waveguide layer is uniaxial crystal and the interface of the two waveguides are all metal) are discussed. The exact solution of the waveguide mode field under different kinds of structures The properties of the mode field vary according to the nature of the uniaxial crystals For positive uniaxial crystals the main mode of the waveguide is transverse and the light waves of any frequency can excite this mode. When certain conditions are met, single mode is propagated in the waveguide, otherwise, high mode will be excited.High order mode is neither TE wave nor TM wave, but a mixed mode in which the two are coupled.For negative uniaxial crystals, The master mode is a hybrid mode that can also be excited by a light wave of any frequency. When the frequency satisfies a certain condition, the waveguide transmits a single mode, otherwise it will excite the higher order hybrid mode