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Title: Light-controlled electric Freedericksz threshold in dye doped liquid crystals

We report the results of measurements of the threshold of Freedericksz transition in a nematic liquid crystal doped by Methyl-red. We show that in case of dc field the threshold voltage can decrease or increase depending on the light dose, due to the light-induced desorption and adsorption of charge complexes from and on the irradiated surface, that has been recently demonstrated. This effect has the potential to be exploited in optical devices such as liquid crystal microlenses and spatial light modulators.
Authors:
; ;  [1]
  1. Dipartimento di Scienze e Ingegneria della Materia, dell'Ambiente ed Urbanistica and CNISM Università Politecnica delle Marche, Ancona (Italy)
Publication Date:
OSTI Identifier:
22304303
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 20; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ADSORPTION; DESORPTION; DOPED MATERIALS; ELECTRIC POTENTIAL; IRRADIATION; LIQUID CRYSTALS; METHYL RED; SURFACES; VISIBLE RADIATION