title: Asymmetric Freedericksz transitions from symmetric liquid crystal cells doped with harvested ferroelectric nanoparticles.
abstract: The electrical Freedericksz transition characteristics of planar aligned liquid crystal cells doped with harvested single ferroelectric domain 9 nm nanoparticles of BaTiO(3) have been measured. We demonstrate for the first time that the electrical pre-history of the cells imparts significant polarity sensitivity to the Freedericksz characteristics. The presence of harvested single domain ferroelectric nanoparticles enables cells to be programmably semi-permanently polarized. This reduces or increases the Freedericksz transition threshold by 0.8 V, depending on the polarity of the applied voltage, giving a net 1.6 V Freedericksz threshold asymmetry for 8 mum thick cells filled with TL205 liquid crystal.
authors: Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Ohio, USA.
authors: G
authors: G
authors: Cook
authors: V Yu
authors: VY
authors: Reshetnyak
authors: R F
authors: RF
authors: Ziolo
authors: S A
authors: SA
authors: Basun
authors: P P
authors: PP
authors: Banerjee
authors: D R
authors: DR
authors: Evans
mesh_terms: D004560:Electricity; D008027:Light; D050866:Liquid Crystals / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation