非平衡软材料的时间非线性光学极化率
Time-dependent Nonlinear Optical Susceptibility of an Out-of-Equilibrium Soft Material
摘要：
本文研究了粘土分散体（Laponite）在有机染料（罗丹明B）水溶液中的非线性吸收随时间的变化。具体地说，我们确定的特征时间$τ_D$的非线性极化率建立由于Soret效应。通过比较$τ_D$与标准动态光散射测量所提供的弛豫时间，我们报告了在两个非常不同的长度尺度上的两个集体扩散时间在老化过程中的非平衡系统的去耦。通过这个演示实验，我们还展示了非线性光学测量在软材料中的后期停滞研究中的潜力。
英文摘要：
We investigate the time-dependent nonlinear optical absorption of a clay dispersion (Laponite) in organic dye (Rhodamine B) water solution displaying liquid-arrested state transition. Specifically, we determine the characteristic time $τ_D$ of the nonlinear susceptibility build-up due as to the Soret effect. By comparing $τ_D$ with the relaxation time provided by standard dynamic light scattering measurements we report on the decoupling of the two collective diffusion times at the two very different length scales during the aging of the out-of-equilibrium system. With this demonstration experiment we also show the potentiality of nonlinear optics measurements in the study of the late stage of arrest in soft materials.
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