Abstract
Conventional formulation of holographic polymer dispersed liquid crystal (HPDLC) has been doped with TiO2 nanoparticles. It was found that local electric field across the LC domain was effectively increased by the TiO2 inclusion in polymer, and the film was electrically driven. Typical inverted sigmoidal decrease to a constant value was obtained with and above 0.1 wt% TiO2. On the other hand TiO2 increased formulation viscosity, giving rise to slow grating formation, low saturation diffraction efficiency, and large decay time of the film. It was also found that resin composition of polyurethane acrylate (PUA)/N‐vinyl‐pyrrollidinone (NVP) = 1.5:1 (by weight) gave closer solubility parameter to TiO2, rapid grating formation, and lower switching voltage than PUA/NVP = 1:1 due to the high reactivity and closer solubility parameter of the resin to TiO2.
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