Light scattering simulation by oblate disc spheres using the null field method with discrete sources located in the complex plane
Light scattering simulation by oblate disc spheres using the null field method with discrete sources located in the complex plane
复制标题
使用位于复平面上的离散源的零场方法进行扁圆盘球体的光散射模拟
DOI：
10.1080/09500340500361346
复制
发表时间：
2006
影响因子：
1.3
通讯作者：
A. Doicu
中科院分区：
文献类型：
--
作者：
J. Hellmers;T. Wriedt;A. Doicu
T矩阵方法，也被称为零场方法(NFM)或扩展边界条件方法(EBCM)，已经成为计算非球形粒子光散射的一种众所周知和备受重视的方法。它最大的优点是有可能获得关于粒子散射特性的所有信息，并将其存储到一个矩阵中。这使得人们能够以较低的努力进行额外的调查。不幸的是，标准的NFM不能收敛于具有极非球形粒子形状的粒子，如长圆柱体或硬币状扁平圆柱体。在这篇文章中，我们研究了扁平圆盘球形式的有限粒子的光散射，它可以被描述为具有圆形边缘的平柱体。我们使用T-矩阵方法的一种高级形式--离散源零场方法(NFM-DS)。通过展示光散射结果，我们想要展示这种先进的NFM-DS提供的潜力。它允许人们计算长宽比(粒子半径和厚度之间的关系)高达100：1，尺寸参数(半径和波长之间的关系)高达30的粒子形状。
The T-matrix method, which is also known as the null field method (NFM) or extended boundary condition method (EBCM), has established itself as a well known and highly regarded method for calculating light scattering by non-spherical particles. Its biggest advantage is the possibility to obtain all information about the scattering characteristics of the particle and to store it into one matrix. This enables one to do additional investigations with low efforts. Unfortunately the standard NFM fails to converge for particles with extremely non-spherical particle shapes, like long cylinders or coin-like flat cylinders. In this paper we investigate light scattering by finite particles in the form of an oblate disc sphere, which can be described as flat cylinders with a rounded edge. We use an advanced form of the T-matrix method—the null field method with discrete sources (NFM-DS). By presenting light scattering results we would like to demonstrate the potential this advanced NFM-DS offers. It allows one to calculate particle shapes with aspect ratios (relation between radius and thickness of the particle) up to 100:1 and size parameters (relation between radius and wavelength) up to 30.