Photoalignment of an Azobenzene-Based Chromonic Liquid Crystal Dispersed in Triacetyl Cellulose: Single-Layer Alignment Films with an Exceptionally High Order Parameter

2015 ◽  
Vol 7 (21) ◽  
pp. 11074-11078 ◽  
Author(s):  
Masaki Matsumori ◽  
Ayami Takahashi ◽  
Yasushi Tomioka ◽  
Takaaki Hikima ◽  
Masaki Takata ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Order Parameter ◽  
Single Layer ◽  
High Order

Tri-state switching of a high-order parameter, double-layered guest-host liquid-crystal shutter, doped with the mesogenic molecule 4HPB

2021 ◽  
pp. 1-6
Author(s):  
Xuewen Xie ◽  
Peng Huang ◽  
Miao Xu ◽  
Yunsheng Ding ◽  
Longzhen Qiu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Order Parameter ◽  
High Order ◽  
State Switching ◽  
Liquid Crystal Shutter

scholarly journals Liquid Crystal Ordering in the Hexagonal Phase of Rod-Coil Diblock Copolymers

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1262
Author(s):  
Mikhail A. Osipov ◽  
Maxim V. Gorkunov ◽  
Alexander A. Antonov
Keyword(s):  
Liquid Crystal ◽  
Order Parameter ◽  
Density Functional ◽  
Diblock Copolymers ◽  
Microphase Separation ◽  
Hexagonal Phase ◽  
Orientational Order ◽  
Order Parameters ◽  
Copolymer Composition ◽  
Rigid Rod

Density functional theory of rod-coil diblock copolymers, developed recently by the authors, has been generalised and used to study the liquid crystal ordering and microphase separation effects in the hexagonal, lamellar and nematic phases. The translational order parameters of rod and coil monomers and the orientational order parameters of rod-like fragments of the copolymer chains have been determined numerically by direct minimization of the free energy. The phase diagram has been derived containing the isotropic, the lamellar and the hexagonal phases which is consistent with typical experimental data. The order parameter profiles as functions of temperature and the copolymer composition have also been determined in different anisotropic phases. Finally, the spatial distributions of the density of rigid rod fragments and of the corresponding orientational order parameter in the hexagonal phase have been calculated.

Study of optical parameters of two fluorinated isothiocyanato nematic liquid crystals exhibiting high birefringence

2014 ◽  
Vol 22 (1) ◽  
Author(s):  
T. Devi ◽  
B. Choudhury ◽  
A. Bhattacharjee ◽  
R. Dabrowski
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Laser Beam ◽  
Order Parameter ◽  
Refractive Indices ◽  
Optical Parameters ◽  
Optical Studies ◽  
High Birefringence ◽  
Two Samples ◽  
Direct Extrapolation

AbstractOptical studies have been carried out on two fluorinated isothiocyanato nematic liquid crystal (LC) compounds 4′-butylcyclohexyl-3, 5-difluoro-4-isothiocyanatobiphenyl and 4′-pentylcyclohexyl-3, 5-difluoro-4-isothiocynatobiphenyl. Transition temperatures of the two samples were confirmed using a polarizing microscope. The two LC compounds were found to exhibit fairly high clearing temperatures. Measurements of refractive indices of the two compounds were done by using thin prism method with He-Ne laser beam of wavelength 630 nm. Birefringence of the two LC compounds was calculated from the measured refractive indices. Both the compounds are found to display fairly high values of birefringence. Validation of a modified four-parameter model, based on Vuks equation describing the temperature dependence of refractive indices of the two liquid crystals, is also presented in this paper. The model is validated by fitting the experimentally measured values of refractive indices, birefringence and average refractive indices of the two nematic LCs with the theoretical values. In this paper, the calculation of order parameters of the LCs is presented by using two methods: direct extrapolation method based solely on the birefringence data and by using modified Vuks method based on Haller’s extrapolation. As observed from the obtained results, this procedure of calculating order parameter gives very reasonable results.

Single layer, tunable, liquid crystal based Pancharatnam phase devices

2021 ◽  
Author(s):  
Brandon Vreeland ◽  
Comrun Yousefzadeh ◽  
Andre van Rynbach ◽  
Douglas Bryant ◽  
Philip J. Bos
Keyword(s):  
Liquid Crystal ◽  
Single Layer ◽  
Pancharatnam Phase

scholarly journals Temperature-concentration behaviour of the order parameter in the nematic phases of a lyotropic liquid crystal

1985 ◽  
Vol 46 (4) ◽  
pp. 589-594 ◽  
Author(s):  
Y. Galerne ◽  
J.P. Marcerou
Keyword(s):  
Liquid Crystal ◽  
Order Parameter ◽  
Lyotropic Liquid Crystal ◽  
Nematic Phases

scholarly journals Phase matching of high-order harmonic generation in single-layer graphene

2020 ◽  
Author(s):  
Roberto Boyero-García ◽  
Óscar Zurrón-Cifuentes ◽  
Luis Plaja ◽  
Carlos Hernandez-Garcia
Keyword(s):  
Harmonic Generation ◽  
Single Layer ◽  
High Order ◽  
Single Layer Graphene ◽  
Phase Matching ◽  
High Order Harmonic Generation ◽  
Layer Graphene ◽  
High Order Harmonic
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