采用时域有限差分法研究了多因素对光学介质薄膜表面冗余节瘤粒子微分散射截面随散射角的变化规律.对光学介质薄膜表面冗余节瘤粒子复合散射进行建模, 并针对典型半空间问题, 对总散射场进行分解并对相应的场相位进行求解, 给出网格剖分规则.将数值结果退化为冗余球体粒子, 与MOM (Method of Moments)矩量法进行详细比较, 验证程序的有效性.分析P偏振光入射下, 入射角、长短轴轴比和镶嵌高度h对Cu和SiO2镶嵌粒子微分散射截面随散射角的影响规律.结果表明：微分散射截面的最大峰值出现在入射角的镜面值角度; 在镜向散射区域附近, 对于扁平回转椭球体粒子微分散射截面随冗余节瘤粒子轴比的增大而减小, 扁长回转椭球粒子的规律相反; 在[-90°,-60°]散射角区域, 微分散射截面与冗余节瘤粒子镶嵌高度成正比, 镶嵌高度对介质粒子散射特性影响更大.

Based on the finite difference time domain method, the effects of multiple factors on the scattering angle distribution of redundant nodule particles in optical media films are studied. The complex scattering of redundant nodule particles in optical media film is modeled, and according to the classic half space problem, the total scattering field is decomposed and the corresponding field phase is solved and the mesh division rules are given. The numerical results are reduced to redundant spherical particles and MOM method (Method of Moments) are compared to verify the validity of the program in detail. The influences of incident angle, axial ratio and inlay height h on the differential scattering cross section of Cu and SiO2 inlaid particles with scattering angle under p polarized light are analyzed. The results show that the maximum peak of the differential scattering cross section occurs at the mirror plane of the incident angle. The differential scattering cross section near the specular scattering area decreases with the increase of the axial ratio of flat redundant particles; the rules of influenced by the axial ratio of prolate ellipsoid particles are opposite. In the region of the scattering angle [-90°, -60°], differential scattering cross section is directly proportional to the height of redundant particle inlay. The scattering properties of dielectric particles are affected more by the inlay height.