Phase retardation vs pretilt angle in liquid crystal cells with homogeneous and inhomogeneous LC director configuration

Abstract

Phase retardation of both extraordinary and ordinary polarized rays passing through a liquid crystal (LC) cell with homogeneous and inhomogeneous LC director distribution is calculated as a function of the LC pretilt angle θ₀ on the cell substrates in the range 0 ≤ θ₀ ≤ 90°. The LC pretilt on both substrates can have the same or opposite direction, thereby forming homogeneous, splay, or bend director configurations. At the same pretilt angle value, the largest phase retardation ΔΦ is observed in splay LC cells, whereas the smallest phase retardation is observed in bend cells. For the θ₀ values close to 0, 45°, and 90°, analytical approximations are derived, showing that phase retardation depends on LC birefringence variation.

Orientational and Optical Properties of Liquid Crystal Domains Bounded by Central Orienting and Surrounding Non-Orienting Surfaces

“…Компьютерное моделирование Как и в [11][12][13][14], ячейка ЖК помещалась между скрещенными поляризатором и анализа-тором. Характеристики жидких кристаллов в значительной мере определяются ориентацией молекул мезогенов на поверхности раздела фаз.…”

“…Характеристики жидких кристаллов в значительной мере определяются ориентацией молекул мезогенов на поверхности раздела фаз. В [11][12][13][14] рассматривалась зависимость интен-сивности и разности фаз луча света, прошедшего через ЖК-среду с неоднородным распределением директора ЖК, и приводились методики расчета и экспериментальных измерений. Для компью-терной модели цилиндрического оптически анизотропного нематического ЖК-домена (образующегося вокруг цилиндрического тела, введенного в изотропную ЖК-среду) были приняты (рис.…”

P‐123: Oblique Light Incidence onto Hybrid Aligned Nematic (HAN) Cells for Optical Compensators

“…A phase difference parameter Φ=ΔФ/ΔФ max was introduced in [16,17]. The phase retardation difference ΔΦ is reduced to its maximum value ΔФ max =2πΔnL/λ, Δn=n e -n o is the LC birefringence.…”

“…The calculation method was firstly described in [16][17][18] for the LC cells with homogeneous, splay or bend director configuration. On the base of such calculation a method of the LC pretilt angle measurement has been developed in [18] for the cells with unknown arbitrary LC director configuration.…”

Spectral photosensitization of optical anisotropy in poly(vinyl cinnamate) solid films

“…The goal of current work is to analyze the formation of sensitized photoinduced optical anisotropy in amorphous poly(vynyl-cinnamate) films (PVCi) and in its derivant poly(vynyl-4-methoxy-cinnamate) (PVMCi) [1][2][3] under the influence of polarized light as well as to find physical mechanisms of this process so that it could improve the materials efficiency in different optics and optical information processing tasks [4][5][6].…”