CUED Publications database

Dynamics in dye-doped LC systems in presence of trans-cis isomerism

Trushkevych, O and Collings, N and Crossland, WA and Wilkinson, TD and Milne, WI (2007) Dynamics in dye-doped LC systems in presence of trans-cis isomerism. Molecular Crystals and Liquid Crystals, 478. pp. 221-232. ISSN 1542-1406

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Abstract

The excitation as well as relaxation dynamics of dye-doped nematic liquid crystal cells has been explored both experimentally and theoretically. Overshoots in the build up of the probe signal diffracted from gratings written onto dye-doped liquid crystal systems have often been observed. The overshoot behaviour makes the accurate measurement of nonlinear optical (NLO) response magnitude difficult and ambiguous. Moreover, it complicates the understanding of the dynamics and the physics of the NLO processes. On the basis of the system with trans-cis isomerisation as a mechanism of the NLO effect the quantitative model has been built to describe the experimental results which we observe. The two unknown material parameters: diffusion coefficient and cis species lifetime are calculated from the relaxation data. A quantitative model of the signal build-up uses these parameters. The calculated dynamic behaviour based on this model correlates very well with the experimental data. The model is used to predict the performance of the system with various dopant diffusion properties.

Item Type: Article
Uncontrolled Keywords: Dye-doped liquid crystal Dynamics Photorefractivity Trans-cis isomerism
Subjects: UNSPECIFIED
Divisions: Div B > Photonics
Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:02
Last Modified: 30 Nov 2014 21:46
DOI: 10.1080/15421400701681224