Nonlinear optical propagation near the Bragg resonance in heliconical cholesteric liquid crystals

2020 ◽  
Vol 45 (23) ◽  
pp. 6510
Author(s):  
F. Simoni
Keyword(s):  
Liquid Crystals ◽  
Nonlinear Optical ◽  
Bragg Resonance ◽  
Cholesteric Liquid Crystals ◽  
Optical Propagation

NONLOCAL OPTICAL PROPAGATION IN NONLINEAR NEMATIC LIQUID CRYSTALS

2003 ◽  
Vol 12 (04) ◽  
pp. 525-538 ◽  
Author(s):  
MARCO PECCIANTI ◽  
CLAUDIO CONTI ◽  
GAETANO ASSANTO ◽  
ANTONIO DE LUCA ◽  
CESARE UMETON
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nonlinear Optical ◽  
Modulational Instability ◽  
Nematic Liquid Crystals ◽  
Liquid Crystal Cell ◽  
Physical Systems ◽  
Crystal Cell ◽  
Optical Propagation ◽  
Spatial Nonlocality

Optical propagation in nematic liquid crystals is characterized by a large and highly-nonlocal Kerr-like nonlinearity. We investigate the fundamental role played by spatial nonlocality in nonlinear optical propagation, and develop a model able to predict the main features of spatial solitons and modulational instability in nematic liquid crystals. The model unifies solitons in physical systems exhibiting different degrees of nonlocality, disclosing a connection between nonlocal solitons and parametric solitons in quadratic media. Finally, soliton breathing as well as other characteristics of nonlocal propagation are experimentally demonstrated in a specifically-engineered liquid crystal cell.

scholarly journals Nonlinear optical imaging of lyotropic cholesteric liquid crystals

2010 ◽  
Vol 18 (2) ◽  
pp. 1113 ◽  
Author(s):  
Ariane Deniset-Besseau ◽  
Paulo De Sa Peixoto ◽  
Gervaise Mosser ◽  
Marie-Claire Schanne-Klein
Keyword(s):  
Liquid Crystals ◽  
Optical Imaging ◽  
Nonlinear Optical ◽  
Cholesteric Liquid Crystals ◽  
Nonlinear Optical Imaging

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

scholarly journals Light-driven rotation of gratings formed by electroconvection patterns in cholesteric liquid crystals

2021 ◽  
pp. 116366
Author(s):  
Ying Xiang ◽  
Hongzhen Jing ◽  
Hao Chen ◽  
Jun zhang ◽  
Xiaoyu Ding ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Cholesteric Liquid Crystals
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