Dielectric and electro-optical properties of a photosensitive liquid crystal

The temperature dependencies of the dielectric and electro-optical properties of a pure photo-ferroelectric liquid crystal have been investigated, in the chiral smectic C (SmC*) phase, with and without ultraviolet (UV) illumination. The SmC* dielectric Goldstone mode characteristics, the spontaneous...

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Bibliographic Details
Published in:Liquid crystals 2009-09, Vol.36 (9), p.899-905
Main Authors: Boussoualem, Y., Ismaili, M., Buisine, J. M., Binet, C., Joly, G., Nguyen, H. T.
Format: Article
Language:English
Subjects:
Chemical compounds
Crystals
dielectric
Dielectric properties
electro-optic
ferroelectric
liquid crystal
photosensitive
Ultraviolet radiation
Viscosity
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Summary:The temperature dependencies of the dielectric and electro-optical properties of a pure photo-ferroelectric liquid crystal have been investigated, in the chiral smectic C (SmC*) phase, with and without ultraviolet (UV) illumination. The SmC* dielectric Goldstone mode characteristics, the spontaneous polarization, the tilt angle and the rotational viscosity are affected by UV irradiation. Under increasing UV light intensities the dielectric strength Δϵ G increases whereas the relaxation frequency f G , the spontaneous polarization P s , the electro-optical rotational viscosity γ eo and the tilt angle θ decrease. The twist elastic constant K 3 and the Goldstone mode rotational viscosity γ G of the studied compound are deduced from dielectric experimental results. Good agreement was found between both viscosities. The observed dielectric behaviours are controlled by the elastic constant and the rotational viscosity variations.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678290903108458