We investigate the nonlinear optics response of a colloidal dispersion undergoing dynamics slowing down with age, by using Z-scan and dynamic light scattering measurements. We study the high optical nonlinearity of an organic dye (rhodamine B) dispersed in a water-clay (laponite) suspension. We consider different clay concentrations (2.0-2.6 wt%) experiencing dynamics arrest. We find that (i) the concentration dependent exponential growth of both mean relaxation time and nonlinear absorption coefficient can be individually scaled to a master curve and (ii) the scaling times are the same for the two physical quantities. These findings indicate that the optical nonlinear susceptibility exhibits the same ageing universal scaling behaviour, typical of disordered out of equilibrium systems. © IOP Publishing Ltd.

Ageing of the nonlinear optical susceptibility in soft matter / N., Ghofraniha; Conti, Claudio; DI LEONARDO, Roberto; B., Ruzicka; Ruocco, Giancarlo. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - STAMPA. - 19:20(2007), p. 205129. [10.1088/0953-8984/19/20/205129]

Ageing of the nonlinear optical susceptibility in soft matter

CONTI, CLAUDIO;DI LEONARDO, ROBERTO;RUOCCO, Giancarlo
2007

Abstract

We investigate the nonlinear optics response of a colloidal dispersion undergoing dynamics slowing down with age, by using Z-scan and dynamic light scattering measurements. We study the high optical nonlinearity of an organic dye (rhodamine B) dispersed in a water-clay (laponite) suspension. We consider different clay concentrations (2.0-2.6 wt%) experiencing dynamics arrest. We find that (i) the concentration dependent exponential growth of both mean relaxation time and nonlinear absorption coefficient can be individually scaled to a master curve and (ii) the scaling times are the same for the two physical quantities. These findings indicate that the optical nonlinear susceptibility exhibits the same ageing universal scaling behaviour, typical of disordered out of equilibrium systems. © IOP Publishing Ltd.
nonlinear optics; soft-matter
01 Pubblicazione su rivista::01a Articolo in rivista
Ageing of the nonlinear optical susceptibility in soft matter / N., Ghofraniha; Conti, Claudio; DI LEONARDO, Roberto; B., Ruzicka; Ruocco, Giancarlo. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - STAMPA. - 19:20(2007), p. 205129. [10.1088/0953-8984/19/20/205129]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/137058
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