Effect of laser illumination on the electro optical characters of dye doped nernatic liquid crystals

Abstract

Electro optical properties of a dye doped nematic liquid crystal system is investigated by concerning the laser induced effects on molecular reorientation. In the scope of this work, various measurements were performed to see the order and tendency of laser heating in a dye doped liquid crystal system including an anthraquinone derivative dye as a doping in E7 coded nematic host. Experimental results exhibit dependency on laser heating in the level of switching voltage of reorientation and analysis of electro optical parameters are investigated by the dependency of dissipation factor in dark and laser induced circumstances for dye doped and no-dye samples. Dielectric anisotropy dependency, which is another feeling of the same effect, is also studied for the mentioned conditions and its dependency is quantitatively estimated by capacitive measurements. (C) 2003 Elsevier B.V. All fights reserved.