Analog optical phase modulator based on chiral smectic and polymer cholesteric liquid crystals

1995 ◽  
Vol 20 (23) ◽  
pp. 2441 ◽  
Author(s):  
Jay E. Stockley ◽  
Gary D. Sharp ◽  
Kristina M. Johnson ◽  
Steven A. Serati
Keyword(s):  
Liquid Crystals ◽  
Phase Modulator ◽  
Cholesteric Liquid Crystals ◽  
Optical Phase ◽  
Polymer Cholesteric Liquid Crystals

scholarly journals The role of conductive dopants in polymer cholesteric liquid crystals

2014 ◽  
Vol 33 (2) ◽  
pp. 287 ◽  
Author(s):  
Anka Trajkovska Petkoska
Keyword(s):  
Liquid Crystals ◽  
Aspect Ratio ◽  
Percolation Threshold ◽  
Polymer Composition ◽  
Threshold Behaviour ◽  
Cholesteric Liquid Crystals ◽  
Metallic Particles ◽  
Different Types ◽  
Polymer Cholesteric Liquid Crystals

<p align="center"> </p><p><strong>Abstract</strong></p><p>Variety of conductive dopants were used to modify the electric properties of polymer cholesteric liquid crystals. Different types of carbon blacks, carbon nanotubes, as well as metallic particles were used as conductive dopants in this work. All of them affected the conductivity of the polymer matrix, but at different dopant concentrations. The percolation threshold behaviour of used dopants in the polymer host showed pronounced dependence on the dopants’ particle size and particle shape anisotropy. For instance,  the higher the aspect ratio of carbon-based dopant particles (aspect ratio = length : diametar), the lower the percolation threshold; while increase in metallic dopants' diameter yielded higher percolation threshold of polymer composition.</p><p align="center"><strong><br /></strong></p>

Monodomain Film Formation and Lasing in Dye-Doped Polymer Cholesteric Liquid Crystals

2004 ◽  
Vol 43 (9A) ◽  
pp. 6142-6144 ◽  
Author(s):  
Takashi Ohta ◽  
Myoung Hoon Song ◽  
Yuko Tsunoda ◽  
Takaaki Nagata ◽  
Ki-Chul Shin ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Film Formation ◽  
Cholesteric Liquid Crystals ◽  
Polymer Cholesteric Liquid Crystals ◽  
Doped Polymer

Adaptable integrated optical phase modulator array using liquid crystals

2006 ◽  
Author(s):  
Kamalpreet Kaur ◽  
Marc Schmiedchen ◽  
Theo Tschudi
Keyword(s):  
Liquid Crystals ◽  
Phase Modulator ◽  
Optical Phase ◽  
Integrated Optical

scholarly journals Synthesis and Characterization of Novel Bio-Chiral Dopants Obtained from Bio-Betulin Produced by a Fermentation Process

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 785
Author(s):  
Veridiana G. Guimarães ◽  
Anastasiia Svanidze ◽  
Tianyi Guo ◽  
Pawan Nepal ◽  
Robert J. Twieg ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Natural Product ◽  
Fermentation Process ◽  
Synthesis And Characterization ◽  
Cholesteric Liquid Crystals ◽  
And Performance ◽  
Chiral Dopants

Cholesteric liquid crystals are frequently produced by the addition of chiral dopants to achiral nematic hosts. We report here the synthesis and performance of chiral dopants obtained from bio-betulin produced by a fermentation process. An important aspect of this work is to point out that the fermentation process used to obtain the starting materials is much easier and cheaper when carried out in large volumes than isolating it from the natural product. The performance of the dopants obtained from bio-betulin is indistinguishable from those obtained from commercially available synthetic betulin.

scholarly journals Augmented Lagrangian preconditioners for the Oseen–Frank model of nematic and cholesteric liquid crystals

2021 ◽  
Author(s):  
Jingmin Xia ◽  
Patrick E. Farrell ◽  
Florian Wechsung
Keyword(s):  
Liquid Crystals ◽  
Augmented Lagrangian ◽  
Augmented Lagrangian Method ◽  
Mass Matrix ◽  
Unit Length ◽  
Mesh Size ◽  
Schur Complement ◽  
Cholesteric Liquid Crystals ◽  
Multigrid Algorithm ◽  
The Cost

AbstractWe propose a robust and efficient augmented Lagrangian-type preconditioner for solving linearizations of the Oseen–Frank model arising in nematic and cholesteric liquid crystals. By applying the augmented Lagrangian method, the Schur complement of the director block can be better approximated by the weighted mass matrix of the Lagrange multiplier, at the cost of making the augmented director block harder to solve. In order to solve the augmented director block, we develop a robust multigrid algorithm which includes an additive Schwarz relaxation that captures a pointwise version of the kernel of the semi-definite term. Furthermore, we prove that the augmented Lagrangian term improves the discrete enforcement of the unit-length constraint. Numerical experiments verify the efficiency of the algorithm and its robustness with respect to problem-related parameters (Frank constants and cholesteric pitch) and the mesh size.

scholarly journals Pitch tuning induced by optical torque in heliconical cholesteric liquid crystals

2019 ◽  
Vol 1 (3) ◽  
Author(s):  
G. Nava ◽  
F. Ciciulla ◽  
O. S. Iadlovska ◽  
O. D. Lavrentovich ◽  
F. Simoni ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Cholesteric Liquid Crystals ◽  
Optical Torque
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