Coated sphere scattering by geometric optics approximation.
Coated sphere scattering by geometric optics approximation.
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DOI：
10.1364/josaa.31.002160
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发表时间：
2014-10
期刊：
影响因子：
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通讯作者：
Zhai Mengran;Lü Qieni;Z. Hongxia;Zhang Yinxin
中科院分区：
文献类型：
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作者：
Zhai Mengran;Lü Qieni;Z. Hongxia;Zhang Yinxin
建立了一种新的几何光学模型来计算涂层球体的光散射，并根据光线是否撞击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/芯界面、涂层/介质界面的反射次数以及芯中的弦数来参数化，并且考虑了撞击芯的光线的简并路径和重复路径项，从而简化了计算。对于缺少核心的射线，各种 GOA 项均由均匀球体处理。计算了包覆颗粒的散射强度，并与Debye级数和Aden-Kerker理论的散射强度进行了比较。结果的一致性证明了本文提出的方法的有效性。
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.