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5 Opto-Electronics Review

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One dimensional model of dye-doped nematic layer for holography

100%

Derfel G. , Buczkowska M. , Parka J.

tom 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.

Dynamic photorefractivity in nematic loquid crystal panels with photoconducting polymeric layers

100%

Agashkov A. , Kovalev A. , Parka J.

tom Vol. 12, No. 3

271-275

A novel mechanism of photorefractivity in nematic liquid crystal (LC) cells is presented. Dynamic photorefractivity is based on temporal quasiperiodic modules excitation in the liquid crystal layer by applied external alternating electric field and their reorientation due to the charges induced by interference optical field on a surface of photoconducting orienting layer.

Optically addressed holographic gratings in LC cells with different layers and high optical anisotropy liquid crystals

100%

Parka J. , Grudniewski T. , Kurioz Y. , Dąbrowski R.

tom Vol. 12, No. 3

317-320

Dynamic optical data storage and other applications in the field of optical data processing would be possible due to development of suitable nonlinear optical materials. In this paper, we present experimental investigations of an orientation photorefractive effect in nematic liquid crystal mixtures with different optical anisotropy and various layers of cell.

Investigations of the diffraction efficiency in dye-doped LC cells under low frequency AC voltage

88%

Grudniewski T. , Parka J. , Dąbrowski R. , Januszko A. , Miniewicz A.

Opto-Electronics Review

2002

tom Vol. 10, No. 1

11-15

In this paper, relation between the diffraction efficiency in LC dye doped cell in two wave mixing system and the applied voltage parameters had been described. The goal of this work was increase in diffraction efficiency using low frequency AC voltage. The LC cells used in the experiments were filled with pure and dye-doped liquid crystal mixtures. In this system, we obtained diffraction efficiency increasing about five to eight times.

Optical data storage in LC cells

88%

Sutkowski M. , Grudniewski T. , Zmijan R. , Parka J. , Nowinowski-Kruszelnicki E.

tom Vol. 14, No. 4

335-337

Liquid crystal devices as a medium for holograms storage have been investigated. Long term memory effects in LC cells have been observed. Experiments proved that certain combination of insulating alignment layers has a major influence on the long term memory effect. Optimal liquid crystal cell construction allows us to achieve sufficient diffraction efficiency to record holographic patterns and to develop a re-writable holographic medium. The configuration of PVK and polyimide layers in LC cell construction with specific LC mixture was tested. The method of permanent and re-writable recording of optical data (holographic pattern) onto LC cells was achieved. However, the method of erasing recorded data was realized but mechanisms of this phenomenon are not clearly understood yet.