光通过纳米颗粒随机散射体透射光强的计算及分析

光通过随机散射体后透射光强的估算,对于提取散射体内部无法直接测量或者无法直接观察的信息至关重要。在分析平行光束通过纳米圆形颗粒随机散射体出射面上光强组成的基础上推导了透射光强的计算公式,并指出多重散射理论、一阶多重散射理论和朗伯比尔定律在一定近似程度上可以相对精确地估算透射光强。这三种方法的估算结果之间会出现四种相对关系。根据这些相对关系,分析了光在散射体内部传输时散射过程的特征以及各种散射过程对出射面光强的贡献大小。

Calculating the transmitted light intensity of light scattering from random scatters is important for extracting information within the scatterers which is unable to be directly measured or observed. On the basis of analyzing the components of the transmitted light intensity from nano-particle random scatterers, it is pointed out that multiple scattering theory, first-order multiple scattering theory and Lambert-Beer law can be used to calculate the transmitted light intensity in relatively precise degree. The formula of the transmitted light intensity has been deduced too. For a given random system, the said three theories are used to numerically calculate the transmitted intensity and there exist four kinds of typical relationships between the three numerical results. Through analyzing the calculated relationships, the scattering processes within the random scatterers and their contribution to the transmitted light intensity have been analyzed.