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Optical data storage in LC cells

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

Opto-Electronics Review

2006

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.

Properties of different LC cells with high optical anisotropy as a dynamic holographic media

Grudniewski T., Parka J.

Opto-Electronics Review

2003

Vol. 11, No. 3

243-245

Dynamic optical data storage and other applications in the field of optical data processing would be possible due to development of suitalbe nonlinear optical materials. The experimental investigations of the orientation photorefractive effect in nematic liquid crystals have been presented. The investigations showed that the orientational optical sensitivity of liquid crystals can be greatly enhanced by an external electric and optical applied field. The photorefractive volume space charge field in the LC cell is the result of charge generation in the bright regions of interference pattern and charge transportation.