Loiko V A, Dick V P, Ivanov A P
Institute of Physics, Academy of Sciences of Belarus, Minsk.
J Opt Soc Am A Opt Image Sci Vis. 2000 Nov;17(11):2040-5. doi: 10.1364/josaa.17.002040.
Coherent and incoherent transmittance values of a monolayer of particles are considered. Such a monolayer is a set of particles whose centers are located in the same plane. We set forth the conditions for the effect of coherent-transmittance quenching, which takes place as a result of the interference between incident and forward-scattered waves. Using the single-scattering approximation we determined size parameters and particle refractive indexes for this interference effect in the case of identical isotropic spherical particles. The influence of polydispersity and the fine structure of light-scattering characteristics on the quenching effect has been estimated. It is shown that the polydispersity destroys this interference effect only at large widths of particle-size distribution functions. The influence of multiple scattering on this effect is considered in the quasi-crystalline approximation. Multiple scattering results in increasing size parameters and decreasing particle concentration at which coherent transmittance quenching takes place in comparison with the case of single scattering. Our theoretical results for suspensions of latex particles in water are in fairly good agreement with the experimental results.
考虑了单层粒子的相干和非相干透过率值。这样的单层是一组其中心位于同一平面内的粒子。我们阐述了相干透过率猝灭效应的条件，该效应是由入射波和前向散射波之间的干涉引起的。在各向同性球形粒子相同的情况下，使用单次散射近似，我们确定了这种干涉效应的尺寸参数和粒子折射率。估计了多分散性和光散射特性的精细结构对猝灭效应的影响。结果表明，多分散性仅在粒径分布函数的宽度较大时才会破坏这种干涉效应。在准晶近似下考虑了多次散射对该效应的影响。与单次散射的情况相比，多次散射导致尺寸参数增加，而相干透过率猝灭发生时的粒子浓度降低。我们关于水中乳胶粒子悬浮液的理论结果与实验结果相当吻合。
