Fluctuations and noise in time-resolved light scattering experiments: measuring temporally heterogeneous dynamics

Agnes Duri; Hugo Bissig; Veronique Trappe; Pierre Ballesta; Luca Cipelletti

doi:10.1117/12.546342

25 May 2004 Fluctuations and noise in time-resolved light scattering experiments: measuring temporally heterogeneous dynamics

Agnes Duri, Hugo Bissig, Veronique Trappe, Pierre Ballesta, Luca Cipelletti

Author Affiliations +

Proceedings Volume 5469, Fluctuations and Noise in Materials; (2004) https://doi.org/10.1117/12.546342
Event: Second International Symposium on Fluctuations and Noise, 2004, Maspalomas, Gran Canaria Island, Spain

Abstract

We use Time Resolved Correlation (TRC), a recently introduced light scattering method, to study the dynamics of a variety of jammed, or glassy, soft materials. The output of a TRC experiment is c_I(t,r), the time series of the degree of correlation between the speckle patterns generated by the light scattered at time t and t + r. We characterize the fluctuations of c_I by calculating their Probability Density Function, their variance as a function of the lag r, and their time autocorrelation function. The comparison between these quantities for a Brownian sample and for jammed materials indicate unambiguously that the slow dynamics measured in soft glasses is temporally heterogeneous. The analogies with recent experimental, numerical and theoretical work on temporal heterogeneity in glassy dynamics are briefly discussed.

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Agnes Duri, Hugo Bissig, Veronique Trappe, Pierre Ballesta, and Luca Cipelletti "Fluctuations and noise in time-resolved light scattering experiments: measuring temporally heterogeneous dynamics", Proc. SPIE 5469, Fluctuations and Noise in Materials, (25 May 2004); https://doi.org/10.1117/12.546342

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