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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。
Based on the principle of time-domain finite difference method, the Faraday rotation effect of magneto-optic photonic crystal based on two multilayer films and a metal grating structure was studied by using FDTD Solutions simulation software. The results show that the enhancement principle of the Faraday rotation effect of the multilayered structure is the transmission spectrum resonance of the incident light in the central layer of the film, while the Faraday effect of the periodic structure of the metal grating is enhanced by the surface plasmon excitation of the metal grating. In the three structures The metal grating periodic structure has a wider Faraday deflection angle enhancement domain. Through the optimization of the parameters, the research on the adjustability of the operating wavelength of the periodic structure of the metal grating is provided, which provides a theoretical basis for the design of the thin film magneto-optical device.