Mechanism of Helix Unwinding in the Ferroelectric Liquid Crystal Phase of Compounds Which Display an Antiferro - Ferri - Ferroelectric Sequence
نویسندگان
چکیده
The behaviour of planar samples of an antiferroelectric liquid crystal under DC electric field has been studied through observations with a polarizing microscope In the ferroelectric phase the dechiralization lines have not been observed under a vanishing electric field. They appeared with the increasing field. To explain that effect, we show by analysing the
منابع مشابه
Adjustable three color optical filters using ferroelectric -dielectric generalized heterostructures photonic crystals
Abstract: The current research is aimed to investigate the alterations of its opticalfeatures of novel adjustable three color narrowband optical filters, which comprise ofblue, green and red light. A narrowband adjustable transmission optical filters accordingto dielectric- ferroelectric heterostructures photonic structures are designed using thetransfer-matrix method (T...
متن کاملDynamic amplification of light signals in photorefractive ferroelectric liquid crystalline mixtures.
The photorefractive effect in photoconductive ferroelectric liquid crystals that contain photoconductive chiral compounds was investigated. Terthiophene compounds with chiral structures were chosen as the photoconductive chiral compounds, and they were mixed with an achiral smectic C liquid crystal. The mixtures exhibit the ferroelectric chiral smectic C phase. The photorefractivity of the mixt...
متن کاملمطالعه خواص الکترونی CaTiO3 در فاز پاراالکتریک و فروالکتریک با استفاده از اصول اولیه
Electronic properties of CaTiO3 crystal in paraelectric and ferroelectric phases have been studied by first principles, using Hohenberg-Kohn-Sham density functional theory (DFT). In paraelectric phase the results show an indirect band gap of about 2eV at -R direction in the Brilluoin zone and a strong hybridization between Ti-3d an O-2P orbital. In ferroelectric phase a direct band gap of abo...
متن کامل44.3: Photo-Aligned Passively Addressed Ferroelectric Liquid Crystal Display Cells: Effect of Aligning Layer Thickness
Effect of photoaligning azo-dye layers thickness on the alignment quality and multiplex operation of passively addressed ferroelectric liquid crystal (FLC) 1.5μm display cells has been investigated. An optimal (about 3~5 nm) azo-dye layer thickness, that provides both the highest multiplex operation steadiness and the best contrast ratio of FLC display cells was found.
متن کامل20.3: Photo-aligned Ferroelectric Liquid Crystal Display with Memorized Gray Scale
The new concept of the passive matrix ferroelectric liquid crystal display (FLCD) with a memorized grey scale is proposed. The physical origin of the gray scale in ferroelectric liquid crystal display is considered. The criterion of reliable bistability is derived dependent on FLC hysteretic behavior in electric field. A new approach for multiplex electronic addressing of the FLCD grey scale is...
متن کامل