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One dimensional model of dye-doped nematic layer for holography

Derfel G., Buczkowska M., Parka J.

Opto-Electronics Review

2006

Vol. 14, No. 2

149-154

The layer of electrically conducting nematic liquid crystal doped with photosensitive dye and confined between polyimide coated electrodes can serve as a diffraction grating. In this paper, the deformations of the nematic director field induced in such a system by external voltage were studied numerically by means of one-dimensional model. The dissociation and recombination of ions were taken into account according to weak electrolyte model. The director orientation in the deformed layers and the distributions of the electric field and of the ion concentrations were calculated for blocking and for conducting electrodes. The effective extraordinary refractive index was also determined as a function of average ion concentration.

Photorefractivity of dye-doped NLC layers and possibility of their application

Parka J.

Opto-Electronics Review

2002

Vol. 10, No. 1

83-87

Photorefractive properties and possibility of guest-host effect application for real time holography have been described. Isothiocyanate nematic liquid mixtures with positive dielectric anisotropy as hosts while antraquinone dyes as guests were used. In dye-doped nematic liquid crystals high diffraction efficiency approaching 20% were obtained. Fast optical grating formation with thee time constant of a few ms have been observed. The dependence of grating formation on strength of applied dc and low frequency of ac electric field, configuration of light polarisation and nematic director orientation were reported.