偶氮染料薄膜光致有序化动力学：两态模型和扩散模型
Kinetics of photoinduced ordering in azo-dye films: two-state and diffusion models
摘要：
我们研究了偶氮染料SD 1光取向层中光致有序的动力学，并提出了使用两种不同的唯象方法进行建模的结果。从二能级分子系综的主方程出发，导出了唯象的二态模型。使用另一种方法，我们制定的二维（2D）扩散模型的自由能Fokker-Planck方程简化的限制制度的纯面内重取向。利用双轴各向异性吸收层光透射问题的精确解，从实验数据中提取了吸收序参量，并利用该模型解释了其与辐照时间的关系。瞬态光致结构被发现是双轴各向异性的，而光稳态和初始状态是单轴的。
英文摘要：
We study the kinetics of photoinduced ordering in the azo-dye SD1 photoaligning layers and present the results of modeling performed using two different phenomenological approaches. A phenomenological two state model is deduced from the master equation for an ensemble of two-level molecular systems. Using an alternative approach, we formulate the two-dimensional (2D) diffusion model as the free energy Fokker-Planck equation simplified for the limiting regime of purely in-plane reorientation. The models are employed to interpret the irradiation time dependence of the absorption order parameters extracted from the available experimental data by using the exact solution to the light transmission problem for a biaxially anisotropic absorbing layer. The transient photoinduced structures are found to be biaxially anisotropic whereas the photosteady and the initial states are uniaxial.
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