Scattering of a spheroidal particle illuminated by a Gaussian beam
Scattering of a spheroidal particle illuminated by a Gaussian beam
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DOI：
10.1364/ao.40.002501
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发表时间：
2001-05-20
期刊：
影响因子：
1.9
通讯作者：
Wu, ZS
中科院分区：
文献类型：
--
作者：
Han, YP;Wu, ZS
提出了一种利用球面坐标下的球面波函数展开高斯光束的方法。利用已知的球坐标束形系数g的表达式，可以方便地计算球坐标下高斯光束的束形系数。散射场和内部电磁场的未知展开系数由一组方程确定，该方程组由电磁矢量的切向分量在球体表面上连续的边界条件导出。给出了高斯光束被均匀的长(扁)球粒子散射问题的解。给出了同轴高斯光束入射时的展开系数和散射光强分布的数值解。(C)2001年美国光学学会。
An approach to expanding a Gaussian beam in terms of the spheroidal wave functions in spheroidal coordinates is presented. The beam-shape coefficients of the Gaussian beam in spheroidal coordinates can be computed conveniently by use of the known expression for beam-shape coefficients, g,, in spherical coordinates. The unknown expansion coefficients of scattered and internal electromagnetic fields are determined by a system of equations derived from the boundary conditions for continuity of the tangential components of the electric and magnetic vectors across the surface of the spheroid. A solution to the problem of scattering of a Gaussian beam by a homogeneous prolate (or oblate) spheroidal particle is obtained. The numerical values of the expansion coefficients and the scattered intensity distribution for incidence of an on-axis Gaussian beam are given. (C) 2001 Optical Society of America.