非球形粒子光散射计算、测量及其应用

摘要/Abstract

摘要： 粒子光散射在众多科学领域有着极其重要的作用, 早期关于粒子光散射的计算大多基于球形粒子假设。但粒子的形状通常并不是完美的球形, 有些粒子还会聚集在一起, 使得外形结构变得更加复杂。Lorentz-Mie 散射理论通常用来计算球形粒子散射, 对于非球形和复杂结构粒子的散射相函数计算则会带来较大偏差。此外, 球形粒子假设对于退偏振效应也无法进行有效的分析。随着计算机算力的提升和算法的改进, 非球形粒子的散射问题除了有限的观测实验研究外, 大多采用数值计算的方法。综述了非球形粒子散射的数值计算方法, 分析了各自的优缺点, 并介绍了非球形粒子光散射实验室测量方法, 以及其在光学、地球物理学、遥感科学、天体物理学、工程学、医学和生物学等领域中的应用。

关键词: 物理光学, 非球形粒子散射, T 矩阵法, 离散偶极子近似法, 分离变量法

Abstract: The characteristics of light scattering by particles play an important role in various scientific fields. The early calculation of particle light scattering is mostly based on the hypothesis of spheroidal particles. However, the shape of the particles is not always theoretically spherical, and the aggregating of the particles makes the shape more complex. Lorentz-Mie scattering theory is usually used to calculate the scattering properties of spheroidal particles, but the calculation of scattering phase function of nonspherical and aggregated particles with the theory will cause larger biases. In addition, the hypothesis of spheroidal particles also fails to effectively analyze the depolarization effect. With the increase of computational power and the improvement of numerical methods, the scattering solutions of non-spherical particles are mostly solved by numerical methods in addition to the limited laboratory experiments. The numerical methods for scattering of non-spherical particles are reviewed, and their advantages and disadvantages are analyzed. The laboratory measurement methods of light scattering by non-spherical particles are also introduced, as well as their applications in the fields of optics, geophysics, remote sensing, astrophysics, engineering, medicine and biology.

Key words: physical optics, non-spherical particle scattering, T matrix, discrete dipole approximation method, separation of variables method

中图分类号:

O436

王颖, 刘东, . 非球形粒子光散射计算、测量及其应用[J]. 量子电子学报, 2020, 37(5): 601-614.

WANG Ying, LIU Dong, . Light scattering calculation and measurement of non-spherical particles and its application[J]. Chinese Journal of Quantum Electronics, 2020, 37(5): 601-614.

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