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

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

Opto-Electronics Review

2004

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.

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.

Non-linear optical properties of epoxy-based polymers with covalently attache chromophores and metallic complexes

Borshch A., Brodyn M., Lyakhovetsky V., Kutsenko A., Maloletov S.

Materials Science

2002

Vol. 20, No. 4

29-48

Non-linearl refraction and absorption in polymer structures based upon diglicidylether of bisphenol A has been studied. The polymers contain organo-metallic complex of nickel(II) NiL(ClO4) 2- or 4-amino-azobenzene as non-linear optically active side groups covalently attached at each monomer unit. The studies have been carried out by polarization technique together with a real time pump and probe technique, dynamic holography and Z-scan. The materials were shown to exhibit fast non-linear response (relaxation time is about 20 ns) together with slow one (relaxation time of the order of tens of hours). This makes it possible to record fast- and long-lived (quasi-stationary) phase holograms. The analysis of possible mechanisms for the polymer refractive index non-linear response in the time range from 10-8 to 105 is presented. In particular, the role of electron polarizability, thermal excitation of the polymer, orientation of the chromophore molecules, and trans-cis isomerization processes are discussed.