在超薄薄膜的基础上, 基于时域有限差分法原理, 利用FDTD Solutions仿真软件分别研究了基于两种多层膜结构和一种金属光栅结构的磁光光子晶体法拉第旋光效应。研究表明, 多层膜结构的法拉第旋光效应增强原理为入射光在薄膜中心层的透射谱谐振, 而金属光栅周期结构的法拉第效应增强是通过金属光栅激发表面等离子体实现的; 在三种结构中, 金属光栅周期结构具有更广的法拉第偏转角增强域。进一步通过参数优化, 实现对金属光栅周期结构工作波长的可调节性研究, 为薄膜型磁光器件设计提供了理论依据。

On the basis of thin films, theoretical stimulations of three photonic crystal models are performed according to the principle of finite-difference time-domain method utilizing the simulation software-FDTD solutions. The models include two multilayer magnetophotonic crystal models and a photonic crystal model called metal grating structure where garnet film is deposited on the glass substrate and periodic gold nanowires are sitting atop. The study shows that the principle of Faraday Effect enhancement of multilayer structure is the transmission spectrum resonance at the center layer of the film. Faraday Effect enhancement of metal grating structure is achieved by exciting the surface plasmas. By comparison, metal grating structure possesses a broader domain of Faraday Effect enhancement among three structures. In addition, study of adjustability of metal grating structure is achieved through the parameter optimization. A theoretical foundation for design of thin-film magneto-optic device is offered.