Novel Polarization Dependence in Diffusing-Wave Spectroscopy of Crystallizing Colloidal Suspensions

Sanyal, S and Sood, AK and Ramkumar, S and Ramaswamy, S and Kumar, N (1994) Novel Polarization Dependence in Diffusing-Wave Spectroscopy of Crystallizing Colloidal Suspensions. In: Physical Review Letters, 72 (18). pp. 2963-2966.

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Abstract

We report an unexpected behavior of the intensity autocorrelation functions CVV ( t ) (polarized) and CHH ( t ) (depolarized) of multiply scattered light from dense colloidal polyball crystals under certain conditions. We find that Cvv(t) saturates at large times as expected for a frozen phase, while CHH(t) decays to zero in a short time as in a fluid. We present a new phenomenological model for this behavior based on decoupled translational and orientational fluctuations in a weakly depolarizing medium. Our study highlights the greater sensitivity of depolarized diffusing-wave spectroscopy as a probe of the dynamics of the medium.

Item Type:	Journal Article
Additional Information:	Copyright for this article belongs to American Physical Society (APS).
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for Theoretical Studies Division of Physical & Mathematical Sciences > Physics
Date Deposited:	10 Dec 2004
Last Modified:	19 Sep 2010 04:13
URI:	http://eprints.iisc.ernet.in/id/eprint/1009

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