In this paper, we present the first observation, to our knowledge, of orientational photorefractive [OPR] effects in nematic liquid crystal film. The effect is attributed to molecular axis reorientation caused by the combination of an applied dc field and the dc space charge field induced by the impinging optical field. The refractive index change is a Kerr-like phenomena, and is quadratically defendant on the electric field strength present, unlike the usual [linear] photorefractive effect. To generate such orientational photorefractive effect in aligned nematic liquid crystal films, the applied dc field strengths are on the order of 100 V/cm.
Nonlinear photorefractive effects in liquid crystals
Proceedings of LEOS'94 ; 2 ; 316-317 vol.2
1994-01-01
131040 byte
Conference paper
Electronic Resource
English
Nonlinear Photorefractive Effects in Liquid Crystals
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