Thermoelectro-optical switching properties in glass-forming calamitic liquid crystal mixtures

Waclaw Witko; C. Selbmann; H. D. Koswig

doi:10.1117/12.215526

2 August 1995 Thermoelectro-optical switching properties in glass-forming calamitic liquid crystal mixtures

Waclaw Witko, C. Selbmann, H. D. Koswig

Proceedings Volume 2372, Liquid Crystals: Materials Science and Applications; (1995) https://doi.org/10.1117/12.215526
Event: Liquid Crystals: Materials Science and Applications, 1994, Zakopane, Poland

Abstract

The mixtures of liquid crystalline derivatives of (Beta) -naphtol esters forming glassy state above room temperature were studied. Nematic and chiral dopants were used to modify mixture properties. Several orienting layers were applied and the thickness of electro-optic cell was between 1.8 and 10 micrometers . Studies of thermo-electro-optical changes of molecular orientations are presented (viz. local cholesteric nematic phase transition and Freedericksz- effect). It is shown that the local change of orientation can be frozen into glassy state and long- time preserved without the orienting field. Relaxation processes appear after the temperature increases above T(subscript g$. The effects of changing molecular orientation stimulated by variations of electric field and temperature can be applied for reversible optical data storage and erasure. The temperature and thickness dependencies of cell parameters were also measured.

Citation Download Citation

Waclaw Witko, C. Selbmann, and H. D. Koswig "Thermoelectro-optical switching properties in glass-forming calamitic liquid crystal mixtures", Proc. SPIE 2372, Liquid Crystals: Materials Science and Applications, (2 August 1995); https://doi.org/10.1117/12.215526

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