scholarly journals Tunable Waveguides Couplers Based on HPDLC for See-Through Applications

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1858
Author(s):  
Sergi Gallego ◽  
Daniel Puerto ◽  
Marta Morales-Vidal ◽  
Manuel G. Ramirez ◽  
Soumia I. Taleb ◽  
...  
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Chemical Composition ◽  
Applied Electric Field ◽  
Transmission Efficiency ◽  
Holographic Recording ◽  
Recording Material ◽  
Polymer Dispersed Liquid Crystals ◽  
Polymer Dispersed ◽  
Tunable Waveguide

Photopolymers have become an important recording material for many applications, mainly related to holography. Their flexibility to change the chemical composition together with the optical properties made them a versatile holographic recording material. The introduction of liquid crystal molecules in a photopolymer based on multifunctional monomer provides us the possibility to generate tunable holograms. The switchable holographic elements are a key point for see-through applications. In this work, we optimize the holographic polymer-dispersed liquid crystals composition to improve the performance of tunable waveguide couplers based on transmission gratings and specifically their response under an applied electric field. A variation around 60% in the transmission efficiency was achieved.

scholarly journals Polymer Dispersed Cholesteric Liquid Crystals With a Toroidal Director Configuration under an Electric Field

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 732
Author(s):  
Anna P. Gardymova ◽  
Mikhail N. Krakhalev ◽  
Victor Ya. Zyryanov ◽  
Alexandra A. Gruzdenko ◽  
Andrey A. Alekseev ◽  
...  
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Electric Field ◽  
Point Defects ◽  
Structural Response ◽  
Optical Filters ◽  
Response Curves ◽  
Polymer Dispersed Liquid Crystal ◽  
Dichroic Dye ◽  
Polymer Dispersed

The electro-optical properties of polymer dispersed liquid crystal (PDLC) films are highly dependent on the features of the contained liquid crystal (LC) droplets. Cholesteric LC droplets with homeotropic boundaries can form several topologically different orientational structures, including ones with single and more point defects, layer-like, and axisymmetric twisted toroidal structures. These structures are very sensitive to an applied electric field. In this work, we have demonstrated experimentally and by computer simulations that twisted toroidal droplets reveal strong structural response to the electric field. In turn, this leads to vivid changes in the optical texture in crossed polarizers. The response of droplets of different sizes were found to be equivalent in terms of dimensionless parameters. In addition, the explanation of this phenomenon showed a comparison of theoretical and experimental structural response curves aids to determine the shape of the droplet. Finally, we demonstrated that the addition of a dichroic dye allows such films to be used as optical filters with adjustable color even without polarizers.

Uniaxially Oriented Films of Polymer Dispersed Liquid Crystals: Textures, Optical Properties and Applications

2005 ◽  
Vol 438 (1) ◽  
pp. 163/[1727]-173/[1737] ◽  
Author(s):  
V. Ya Zyryanov ◽  
A. V. Barannik ◽  
V. V. Presnyakov ◽  
S. L. Smorgon ◽  
A. V. Shabanov ◽  
...  
Keyword(s):  
Optical Properties ◽  
Liquid Crystals ◽  
Polymer Dispersed Liquid Crystals ◽  
Oriented Films ◽  
Polymer Dispersed

scholarly journals Electrical properties of a liquid crystal dispersed in an electrospun cellulose acetate network

2018 ◽  
Vol 9 ◽  
pp. 155-163 ◽  
Author(s):  
Doina Manaila Maximean ◽  
Octavian Danila ◽  
Pedro L Almeida ◽  
Constantin Paul Ganea
Keyword(s):  
Liquid Crystal ◽  
Cellulose Acetate ◽  
Indium Tin Oxide ◽  
Electric Energy ◽  
Equivalent Model ◽  
Electrical Characteristics ◽  
Impedance Measurements ◽  
Polymer Dispersed Liquid Crystals ◽  
Polymer Dispersed ◽  
Crystal Composite

Electro-optical devices that work in a similar fashion as PDLCs (polymer-dispersed liquid crystals), produced from cellulose acetate (CA) electrospun fibers deposited onto indium tin oxide coated glass and a nematic liquid crystal (E7), were studied. CA and the CA/liquid crystal composite were characterized by multiple investigation techniques, such as polarized optical microscopy, dielectric spectroscopy and impedance measurements. Dielectric constant and electric energy loss were studied as a function of frequency and temperature. The activation energy was evaluated and the relaxation time was obtained by fitting the spectra of the dielectric loss with the Havriliak–Negami functions. To determine the electrical characteristics of the studied samples, impedance measurements results were treated using the Cole–Cole diagram and the three-element equivalent model.

Effect of a chiral dopant on the electro-optical properties of polymer-dispersed liquid-crystal films

2007 ◽  
Vol 105 (4) ◽  
pp. 2185-2189 ◽  
Author(s):  
Wenbo Li ◽  
Hongxue Zhang ◽  
Liping Wang ◽  
Canbin Ouyang ◽  
Xiaokang Ding ◽  
...  
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Liquid Crystal Films ◽  
Polymer Dispersed Liquid Crystal ◽  
Crystal Films ◽  
Polymer Dispersed

Effects of reaction temperature on electro-optical properties of polymer-dispersed liquid crystal films fabricated by nucleophile-initiated thiol-ene click reaction

2017 ◽  
Vol 32 (12) ◽  
pp. 968-972
Author(s):  
毛远洪 MAO Yuan-hong ◽  
邵磊山 SHAO Lei-shan ◽  
李静静 LI Jing-jing ◽  
钟向宏 ZHONG Xiang-hong ◽  
肖树萌 XIAO Shu-meng ◽  
...  
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Reaction Temperature ◽  
Click Reaction ◽  
Liquid Crystal Films ◽  
Polymer Dispersed Liquid Crystal ◽  
Crystal Films ◽  
Polymer Dispersed
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