Time-dependent Nonlinear Optical Susceptibility of an Out-of-Equilibrium Soft Material

Details Time-dependent Nonlinear Optical Susceptibility of an Out-of-Equilibrium Soft Material Time-dependent Nonlinear Optical Susceptibility of an Out-of-Equilibrium Soft Material

2008-01-23

arxiv.org/abs/0801.3612v2

Phys. Rev. Lett. Vol. 102 (3), article 038303 (2009)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.102.038303

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 $\tau_D$ of the nonlinear susceptibility build-up due as to the Soret effect. By comparing $\tau_D$ 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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