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8 September 2004 Surfactant-controlled light-induced reorientation in dye-doped nematic liquid crystals
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We show that a very large optical response is obtained in azo-dye doped nematic liquid crystals for low input light intensities (of the order of a few tens of μW/cm2 and that this extreme sensitivity of the nematic film results from a combined action of the photoisomerization process of the azo-dye molecules and the light-induced changes of the anchoring energy. The liquid crystal reorientation can be controlled by changing the molecular length of the ionic surfactant which is used as anchoring agent.
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Stefania Residori and Artyom Petrosyan "Surfactant-controlled light-induced reorientation in dye-doped nematic liquid crystals", Proc. SPIE 5464, Organic Optoelectronics and Photonics, (8 September 2004);

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