6 research outputs found
Writing and Erasure of Holographic Gratings in Dye-Doped Polymer Dispersed Liquid Crystals
Polymer-dispersed liquid crystals: effects of photorefractivity and local heating on holographic recording
Light-induced molecular adsorption and reorientation at polyvinylcinnamate-fluorinated/liquid-crystal interface
We have carried out a detailed experimental study, by means of x-ray reflectometry (XRR) and half-leaky
guided mode (HLGM) optical characterization, of the light-induced molecular adsorption and reorientation at
the polyvinylcinnamate-fluorinated (PVCN-F)/liquid-crystal (LC) interface of a LC cell doped with the azodye
methyl red (MR). The XRR data allowed characterizing the microscopic structure of the adsorbed dye
layer both before irradiation (dark adsorption) and after irradiation (light-induced adsorption). The HLGM
optical characterization has made possible the experimental determination of the nematic director profile in the
LC cell and evaluation of the effects of light-induced adsorption on the LC anchoring conditions. The experimental
findings have confirmed the formation of a dark-adsorbed layer and are in agreement with the absorption
model previously proposed to account for the complex phenomenology related to light-induced anchoring
and reorientation in dye-doped liquid crystals