波状膜层全角度偏振分束特性的分析

Analysis of the all-angle polarization beam splitting effect of the multi-layered wavy films

从能带结构和等频面两方面完整阐述了利用光子晶体实现全角度偏振分束的条件,分析等频面目的在于确保波矢的切向分量保持连续,采用时域有限差分(FDTD)方法模拟了高斯光束在波状膜层中的传播过程,通过对比TE模与TM模在0°—89°不同入射角情况下的振幅透射系数,理论上验证了波状膜层的全角度偏振分束效应.

The necessary conditions of all-angle polarization beam splitting effect of photonic crystal is discussed from the aspects of band structure and equal frequency surface. The conservation law of the tangential k-vector component is illustrated in the equal frequency surface. In order to theoretically verify the all-angle polarization beam splitting effect, finite-difference time-domain （FDTD） method is employed to simulate the propagation of Gauss beam in the multi-layered wavy films, getting the transmission coefficients for the TE and TM modes in the angle range from 8° to 89°respectively.