纳米分形银胶的光学特性
Optics of Nanostructured Fractal Silver Colloids
摘要：
基于分形团簇的光学性质理论，提出了一种新的解决方案，该方法是对耦合偶极法的一种基于算符的改进，它能有效地描述任何多分散银胶体的光学光谱的演化，其颗粒尺寸在大多数特征尺寸（5 - 30 nm）范围内。在这个范围内，经典电动力学的著名方法（包括米氏理论）的应用结果与实验数据不一致。这种介质的参数的变化对光谱的影响进行了研究的数值模拟，它占粒子电动偶极子偶极相互作用。事实上，这种相互作用被证明是一个关键因素，在确定扩大的溶胶吸收光谱过程中的分形聚集。定量解释了不同类型银胶的光谱吸收轮廓中出现个别特征的原因。
英文摘要：
Based on the theory of the optical properties of fractal clusters, which is an operator-based modification of the coupled-dipole method, an alternate solution is proposed for the problem of adequately describing the evolution of optical spectra of any polydisperse silver colloid with particles falling within the range of most characteristic sizes (5 - 30 nm). This is the range over which the results of the application of the well-known methods of classical electrodynamics, including the Mie theory, disagree with experimental data. The effect of variation of the parameters of such media on optical spectra is studied by a numerical simulation, which accounts for particle electrodynamic dipole-dipole interactions. Indeed, such interactions are shown to be a key factor in determining the broadening of the sol absorption spectra during the course of fractal aggregation. A quantitative explanation is given for the reasons for the appearance of individual specific features in the contours of the spectral absorption of different types of silver colloids.
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