纳米及微米磁性颗粒在长波长下的光散射特性分析

Analysis of Scattering Properties for Nanometer and Micrometer Magnetic Particles

根据Mie散射理论，分析计算了纳米级、微米级磁性颗粒的光散射特性。针对目前在导航、遥控及雷达等行业广泛应用的纳米、微米磁性颗粒，在Mie散射系数中引入磁导率变量，对比分析了磁性与非磁性颗粒、吸收性与非吸收性颗粒的散射特性规律。数值计算结果表明，磁导率的变化对具有吸收性磁性颗粒的散射特性造成影响，随着磁导率的增大，颗粒的散射光强及吸收性能将逐渐增大，同时磁导率增大对颗粒散射特性的影响将会受到复折射率实部的制约。

The light-scattering properties of nanometer or micrometer magnetic particles were analysed based on Mie scattering theory. According to the widely-used nanometer or micrometer magnetic particles, the effects of the permeability,refractive index and the particle size on the scattering characteristics were analyzed. The scattering characteristics by magnetic and non-magnetic particles were also compared analytically as well as those by absorbent and transparent particles. The numerical results indicated that the permeability variation had influences on the scattering characteristics such as scattering intensity and absorption property. It was found that the scattering intensity and absorption ability increased towards high permeability while its effect on the particles scattering characteristics was restricted simultaneously by the real part of complex refractive index.