title: Orientational photorefractive holograms in porphyrin:Zn-doped nematic liquid crystals.
abstract: We investigated the diffraction properties of dynamic holograms recorded in porphyrin:Zn doped nematic liquid crystals (NLCs) under the influence of an applied dc electric field for various conditions of the grating period, the writing beam intensity and the applied electric field. We also derived an analytic expression for diffraction efficiency from NLCs material equations and torque balance equations and compared the experimental results with the theory, revealing excellent agreement.
authors.affiliation: Department of Physics, Yeungnam University, Kyongsan 712-749, Korea.
authors.forename: Eun Ju
authors.initials: EJ
authors.lastname: Kim
authors.forename: Hye Ri
authors.initials: HR
authors.lastname: Yang
authors.forename: Sang Jo
authors.initials: SJ
authors.lastname: Lee
authors.forename: Gun Yeup
authors.initials: GY
authors.lastname: Kim
authors.forename: Chong Hoon
authors.initials: CH
authors.lastname: Kwak