Photonic defect modes of cholesteric liquid crystals

1999 ◽  
Vol 60 (6) ◽  
pp. 6852-6854 ◽  
Author(s):  
Young-Chol Yang ◽  
Chul-Sik Kee ◽  
Jae-Eun Kim ◽  
Hae Yong Park ◽  
Jong-Cheon Lee ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Cholesteric Liquid Crystals ◽  
Defect Modes

Optical manipulation of photonic defect-modes in cholesteric liquid crystals induced by direct laser-lithography

2008 ◽  
Vol 516 (9) ◽  
pp. 2358-2362 ◽  
Author(s):  
Hiroyuki Yoshida ◽  
Chee Heng Lee ◽  
Yusuke Miura ◽  
Akihiko Fujii ◽  
Masanori Ozaki
Keyword(s):  
Liquid Crystals ◽  
Optical Manipulation ◽  
Cholesteric Liquid Crystals ◽  
Defect Modes ◽  
Laser Lithography ◽  
Direct Laser

scholarly journals CHOLESTERIC LIQUID CRYSTALS WITH TUNABLE DEFECT INSIDE

2011 ◽  
Vol 25 (18) ◽  
pp. 1511-1520 ◽  
Author(s):  
A. H. GEVORGYAN ◽  
K. B. OGANESYAN ◽  
E. M. HARUTYUNYAN ◽  
S. H. HARUTYUNYAN ◽  
E. A. SANTROSYAN
Keyword(s):  
Liquid Crystals ◽  
Layer Thickness ◽  
Defect Mode ◽  
Defect Layer ◽  
Refraction Coefficient ◽  
Cholesteric Liquid Crystals ◽  
Defect Modes ◽  
Defect Location ◽  
Layer Position

Peculiarities of the defect modes of cholesteric liquid crystals (CLCs) with an isotropic/anisotropic defect inside are investigated. The influence of the defect layer thickness and its anisotropy of refraction, the influence of the system thickness and of the defect layer position in the system, as well as the influence of the dielectric borders on the defect modes are investigated. It is shown that it is possible to change reflection at the defect modes in wide intervals and change the defect mode wavelength, by tuning the defect location and its thickness. Such a system possesses transmission asymmetry. Also, the CLC system thickness and the refraction coefficient of the medium bordering the CLC layer on its both sides have essential influence on the reflection at the defect mode and on the reflection frequency.

Tunable Chiral Photonic Defect Modes in Locally Polymerized Cholesteric Liquid Crystals

2007 ◽  
Vol 477 ◽  
pp. 255-262
Author(s):  
Hiroyuki Yoshida ◽  
Chee Heng Lee ◽  
Akihiko Fujii ◽  
Masanori Ozaki
Keyword(s):  
Liquid Crystals ◽  
Cholesteric Liquid Crystals ◽  
Defect Modes

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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