Fourier-transform-based interferometric technique for measuring the elastic anisotropy of a dye-doped liquid crystal

1999 ◽  
Author(s):  
Domenico De Feo ◽  
Sergio De Nicola ◽  
Pietro Ferraro ◽  
Pasqualino Maddalena ◽  
Domenico Paparo ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Liquid Crystal ◽  
Elastic Anisotropy ◽  
Interferometric Technique

New structure induced by elastic anisotropy in cylindrical nematic liquid crystal

2017 ◽  
Vol 13 (2) ◽  
pp. 4705-4717
Author(s):  
Zhang Qian ◽  
Zhou Xuan ◽  
Zhang Zhidong
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nematic Liquid Crystal ◽  
Elastic Anisotropy ◽  
Nematic Liquid Crystals ◽  
Gennes Theory

Basing on Landau–de Gennes theory, this study investigated the chiral configurations of nematic liquid crystals confined to cylindrical capillaries with homeotropic anchoring on the cylinder walls. When the elastic anisotropy (L2/L1) is large enough, a new structure results from the convergence of two opposite escape directions of the heterochiral twist and escape radial (TER) configurations. The new defect presents when L2/L1≥7 and disappears when L2/L1<7. The new structure possesses a heterochiral hyperbolic defect at the center and two homochiral radial defects on both sides. The two radial defects show different chiralities.

scholarly journals Accurate control of a liquid-crystal display to produce a homogenized Fourier transform for holographic memories

2007 ◽  
Vol 32 (17) ◽  
pp. 2511 ◽  
Author(s):  
Andrés Márquez ◽  
Sergi Gallego ◽  
David Méndez ◽  
Mariela L. Álvarez ◽  
Elena Fernández ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Liquid Crystal ◽  
Liquid Crystal Display ◽  
Holographic Memories

Refractive index measurements and order parameter determination of the liquid crystal p-ethoxybenzilidene-p-n-butylaniline

1981 ◽  
Vol 59 (4) ◽  
pp. 515-520 ◽  
Author(s):  
P. Palffy-Muhoray ◽  
D. A. Balzarini
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Order Parameter ◽  
Orientational Order ◽  
Parameter Determination ◽  
Refractive Indices ◽  
Temperature Changes ◽  
Interferometric Technique ◽  
Anisotropic Fluids

Using a simple new interferometric technique, the ordinary and extraordinary refractive indices of the nematic liquid crystal p-ethoxybenzilidene-p-n-butylaniline have been measured separately as a function of temperature. Changes in the refractive indices have been measured with an accuracy of ±0.005% and the absolute values with an accuracy of ±0.5%. Thermal expansivity data has been obtained by utilizing a specially constructed thermometer containing the sample. By using a recently developed Clausius–Mossotti relation for anisotropic fluids, the effective molecular polarizability and hence the orientational order parameter have been obtained from refractive index and density measurements as a function of temperature.

Elastic anisotropy effects on the electrical responses of a thin sample of nematic liquid crystal

2017 ◽  
Vol 95 (3) ◽  
Author(s):  
O. A. Gomes ◽  
C. A. R. Yednak ◽  
R. R. Ribeiro de Almeida ◽  
R. T. Teixeira-Souza ◽  
L. R. Evangelista
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Elastic Anisotropy ◽  
Thin Sample ◽  
Electrical Responses
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