Radiative Transfer Theory and Diffusion of Light in Nematic Liquid Crystals
作者:
Holger Stark,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 321,
issue 1
页码: 403-418
ISSN:1058-725X
年代: 1998
DOI:10.1080/10587259808025106
出版商: Taylor & Francis Group
关键词: Nematic liquid crystals;light scattering;radiative transfer theory;diffusion
数据来源: Taylor
摘要:
In nematic liquid crystals light is strongly scattered from director fluctuations. We are interested in the limit where the incoming light wave is scattered many times. Then, the light transport can be described by a diffusion equation for the energy density of light with diffusion constants D∥and D⊥, respectively, parallel and perpendicular to the director. We start from a radiative transfer theory, connect the diffusion constants to the dynamic structure factor of director fluctuations, and shortly discuss our results. Temporal correlations of the diffusing light probe the dynamics of director modes on much shorter time scales than single light scattering experiments. To account for the decaying temporal correlations, one has to add an absorption term to the diffusion equation, which we also link to the dynamic structure factor.
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