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Proceedings Paper

Thermoelectro-optical switching properties in glass-forming calamitic liquid crystal mixtures
Author(s): Waclaw Witko; C. Selbmann; H. D. Koswig
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Paper 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.

Paper Details

Date Published: 2 August 1995
PDF: 8 pages
Proc. SPIE 2372, Liquid Crystals: Materials Science and Applications, (2 August 1995); doi: 10.1117/12.215526
Show Author Affiliations
Waclaw Witko, Henryk Niewodniczanski Institute of Nuclear Physics (Poland)
C. Selbmann, Technische Univ. Berlin (Germany)
H. D. Koswig, Technische Univ. Berlin (Germany)


Published in SPIE Proceedings Vol. 2372:
Liquid Crystals: Materials Science and Applications
Jozef Zmija, Editor(s)

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