讨论了基于薄膜-光栅混合结构的导模共振滤光片中的古斯-亨兴位移与光束形变现象。模拟结果表明, 这种结构可以产生入射光波长300倍量级的横向位移量, 同时位移最大的波长上反射率也最大, 因而便于实验观测与在实际应用中提高能量利用率。分别采用经典的稳态位相法以及基于高斯光束角谱展开的数值计算方法, 计算了有限大小光束入射到薄膜-光栅结构后所产生的古斯-亨兴位移效应以及相伴的光束变形效应, 着重讨论了入射光束腰斑大小对位移量的影响, 这些数值模拟可为下一阶段的实验打下理论基础。

Large Goos-Hanchen(GH) lateral shift and beam deformation for the guided mode resonant filter are fully discussed. Simulation results proved that this structure could generate lateral displacement as large as 300 λ0. Light waves that experience largest lateral displacement have maximum reflectivity, so it is relatively easier for experimental verification, and would facilitate practical application for its high energy utilization. Two analysis methods based on stationary approach and Gaussian angular decomposition technique are applied, and the lateral shift properties as well as companied beam deformation is fully analyzed. Dependence of the lateral displacement depends on the incident beam width is mainly discussed. This theoretical analysis paves the wave for the next step of manufacturing and testing.