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

Neda Ghofraniha, Claudio Conti, Giancarlo Ruocco, and Francesco Zamponi
Phys. Rev. Lett. 102, 038303 – Published 23 January 2009

Abstract

We investigate the time-dependent nonlinear optical absorption of a clay dispersion (Laponite) in an organic dye (rhodamine B) water solution displaying liquid-arrested state transition. Specifically, we determine the characteristic time τD of the nonlinear susceptibility buildup due to the Soret effect. By comparing τD 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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  • Received 22 January 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.038303

©2009 American Physical Society

Authors & Affiliations

Neda Ghofraniha1, Claudio Conti2, Giancarlo Ruocco1,2, and Francesco Zamponi3

  • 1Dipartimento di Fisica, Università di Roma “La Sapienza”, P. A. Moro 2, 00185, Roma, Italy
  • 2SOFT-INFM-CNR, c/o Università di Roma “La Sapienza”, P. A. Moro 2, 00185, Roma, Italy
  • 3Laboratoire de Physique Théorique, École Normale Supérieure, 24 Rue Lhomond, 75231 Paris Cedex 05, France

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Vol. 102, Iss. 3 — 23 January 2009

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