Structure and Morphology of Polymer-Stabilized Cholesteric Diffraction Gratings

Polymer-Stabilized Diffraction Gratings from Cholesteric Liquid Crystals

Interlaced cholesteric liquid crystal fingerprint textures via sequential UV-induced polymer- stabilization

Two types of cholesteric liquid crystal (CLC) fingerprint structures, namely developable-modulation (DM) and growing-modulation (GM), can be contemporaneously prepared in polymer stabilized CLC (PSCLC) composites, to be mutually perpendicular in a repeatable and reversible voltage-switching process when the cell thickness to pitch length ratios (d/P) were appropriately chosen. PSCLC grating str...

Electrically-controlled two-dimensional gratings based on layers undulations in cholesteric liquid crystals

We developed electrically-switchable two-dimensional diffractive gratings with periodic refractive index modulation arising from layers undulations in cholesteric liquid crystal. Two-dimensional layer undulations occur above the threshold voltage when a planar cholesteric cell of thickness much larger than the cholesteric pitch is subjected to an electric field. The periodic structure of the la...

Liquid crystal blazed gratings formed in a single-step through photo-induced localization of polymer into a prismatic structure.

A liquid crystal blazed grating having a prismatic polymer microstructure has been developed. The polymer structure is fabricated by photo-induced localization and polymerization of a small concentration of monomer onto one substrate of an electro-optical cell by using ultraviolet light irradiation at the direction 45 degrees from normal incident. Using this method a periodical one-dimensional ...

Switchable two-dimensional gratings based on field-induced layer undulations in cholesteric liquid crystals.

We propose switchable two-dimensional (2D) diffractive gratings with periodic refractive-index modulation arising from layer undulations in cholesteric liquid crystals. The cholesteric cell can be switched between two states: (1) flat layers of a planar cholesteric texture and (2) a square lattice of periodic director modulation associated with layer undulations that produces 2D diffraction pat...