Liquid crystal gratings based on alternate TN and PA photoalignment
Wei Hu,Abhishek Kumar Srivastava,Fei Xu,Jiatong Sun,Xiao-wen Lin,Hong-Qing Cui,Vladimir G. Chigrinov,Yan-qing Lu +7 more
TLDR
Unique four-state feature of the cell is obtained and their applications in optical logic devices are discussed.Abstract:
A diffraction grating is proposed by periodically defining the liquid-crystal director distribution to form alternate parallel aligned and twist nematic regions in a cell placed between two crossed polarizers. Based on the combined phase and amplitude modulation, both 1D and 2D tunable gratings are demonstrated. Low voltage ON/OFF switching of 1st order diffracted light with extinction ratio over 80 is achieved within a small voltage interval of 0.15 Vrms. Unique four-state feature of the cell is obtained and their applications in optical logic devices are discussed.read more
Citations
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Dynamic Control of Light Direction Enabled by Stimuli-Responsive Liquid Crystal Gratings.
TL;DR: The authors summarize the research and development on stimuli-controllable diffraction gratings and beam steering using LCs as the active optical materials and describes dynamic gratings fabricated by applying external field forces or surface treatments.
Journal ArticleDOI
Arbitrary Photo-Patterning in Liquid Crystal Alignments Using DMD Based Lithography System
Hao Wu,Wei Hu,Hua-chao Hu,Xiao-wen Lin,Ge Zhu,Jae-Won Choi,Vladimir G. Chigrinov,Yan-qing Lu +7 more
TL;DR: In this paper, a micro-lithography system with a digital micro-mirror device as dynamic mask forms arbitrary micro-images on photoalignment layers and further guides the LC molecule orientations.
Journal ArticleDOI
Generating Switchable and Reconfigurable Optical Vortices via Photopatterning of Liquid Crystals
Bingyan Wei,Wei Hu,Yang Ming,Fei Xu,S. Rubin,Jian-guo Wang,Vladimir G. Chigrinov,Yan-qing Lu +7 more
TL;DR: Liquid-crystal fork gratings are demonstrated through photopatterning realized on a DMD-based microlithography system, which supplies a new strategy for generating fast switchable, reconfigurable, wavelength-tolerant and polarization-insensitive optical vortices.
Journal ArticleDOI
Fast switchable grating based on orthogonal photo alignments of ferroelectric liquid crystals
TL;DR: In this paper, a fast switchable grating based on ferroelectric liquid crystals and orthogonal planar alignment by means of photo alignments is presented, which provides fast response time of around 20μs, contrast of 7000:1 and high diffraction efficiency, at the electric field of 6´V/μm.
Journal ArticleDOI
Large birefringence liquid crystal material in terahertz range
Lei Wang,Xiao-wen Lin,Xiao Liang,Jingbo Wu,Wei Hu,Zhigang Zheng,Biaobing Jin,Yi-qiang Qin,Yan-qing Lu +8 more
TL;DR: In this paper, a fluorinated phenyl-tolane based nematic mixture was developed and evaluated using terahertz time domain spectroscopy (THz-TDS).
References
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Journal ArticleDOI
Tristable nematic liquid-crystal device using micropatterned surface alignment
TL;DR: This work has demonstrated how bistability can be robustly engineered into a nematic LC device, by patterning a substrate with an orientational chequerboard pattern that enforces orthogonal LC alignment in neighbouring square domains, and extended this symmetry approach to obtain a tristable surface-aligned nematicLC.
Journal ArticleDOI
Phase-only modulation with twisted nematic liquid-crystal spatial light modulators.
TL;DR: It is shown that twisted nematic liquid-crystal spatial light modulators behave as phase-only modulators when operated below the conventional optical threshold and behave as spatial amplitude modulator when used between crossed polarizers above the optical threshold.
Journal ArticleDOI
An electro‐optically controlled liquid crystal diffraction grating
TL;DR: In this paper, a structure for an electro-optically controlled liquid crystal diffraction grating is proposed, which can dramatically simplify the fabrication process of liquid crystal optical gratings and gives 100% diffraction efficiency and no polarization direction dependence.
Journal ArticleDOI
High-efficiency and fast-response tunable phase grating using a blue phase liquid crystal.
Jin Yan,Yan Li,Shin-Tson Wu +2 more
TL;DR: A tunable phase grating is demonstrated using a polymer-stabilized blue phase liquid crystal that shows submillisecond response time and holds great potential for photonics and display applications.
Journal ArticleDOI
Synthesis and properties of azo dye aligning layers for liquid crystal cells
Vladimir G. Chigrinov,Elena K. Prudnikova,V.M. Kozenkov,Hoi Sing Kwok,Hidenari Akiyama,Tatsuo Kawara,Hirokazu Takada,Haruyoshi Takatsu +7 more
TL;DR: In this paper, the rotational diffusion of the azo dye molecules in the field of the polarized light was investigated and the synthesis and properties of azo dyes that can be used for photoaligning liquid crystals (LCs) were investigated.
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