Mengran Zhai, Qieni Lü, Hongxia Zhang, Yinxin Zhang
J Opt Soc Am A Opt Image Sci Vis. 2014 Oct 1;31(10):2160-9. doi: 10.1364/JOSAA.31.002160.
A new geometric optics model has been developed for the calculation of light scattering by a coated sphere, and the analytic expression for scattering is presented according to whether rays hit the core or not. The ray of various geometric optics approximation (GOA) terms is parameterized by the number of reflections in the coating/core interface, the coating/medium interface, and the number of chords in the core, with the degeneracy path and repeated path terms considered for the rays striking the core, which simplifies the calculation. For the ray missing the core, the various GOA terms are dealt with by a homogeneous sphere. The scattering intensity of coated particles are calculated and then compared with those of Debye series and Aden-Kerker theory. The consistency of the results proves the validity of the method proposed in this work.
已经开发了一种新的几何光学模型来计算涂层球体的光散射，并根据光线是否击中核心给出了散射的解析表达式。各种几何光学近似（GOA）项的光线通过涂层/核心界面、涂层/介质界面的反射次数以及核心中的弦数进行参数化，对于击中核心的光线考虑了简并路径和重复路径项，这简化了计算。对于未击中核心的光线，各种GOA项由均匀球体处理。计算了涂层颗粒的散射强度，然后与德拜级数和阿登 - 克尔克理论的散射强度进行比较。结果的一致性证明了本工作中提出的方法的有效性。
