双球粒子对任意入射单波束及双波束的散射

基于广义Lorenz-Mie理论，研究了双介质球粒子对任意角度入射波束的散射.将入射波束用球矢量波函数展开，推导了双介质球形粒子对任意入射单波束的散射方程；将该方法进一步推广，研究了双波束任意入射时的情况.以Gauss波束为例，对以上理论进行了数值验证，比较分析了单波束及双波束任意入射时散射特性随入射方向、球心距等参数的变化关系. 关键词： 广义波束因子 双球粒子 Gauss波束

Scattering of bi-sphere arbitrarily illuminated by a single beam and a dual beam

In the framework of the generalized Lorenz-Mie theory (GLMT), the scattering of arbitrarily incident shaped beam by dielectric bi-sphere is investigated. By expressing the incident beam with arbitrary incidence angle in terms of the spherical vector wave function, we derive the scattering equations of bi-sphere arbitrarily illuminated by a single beam, and then extend to the case of scattering of dual-beam. As an example, numerical computations for the scattered intensities of bi-sphere randomly irradiated by a single Gaussian beam and by two Gaussian beams are presented respectively after numerical verifications. In particular, the scattering properties for the two cases are compared and discussed theoretically in detail with respect to different parameters such as incident angle, center-center separation, etc.