Numerical characterization of nematic liquid crystal microstructures under applied electric fields

2013 ◽  
Author(s):  
N. C. Papanicolaou ◽  
M. A. Christou ◽  
A. C. Polycarpou
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Electric Fields ◽  
Numerical Characterization

scholarly journals Capillary Flows of Nematic Liquid Crystal

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1029
Author(s):  
Dina V. Shmeliova ◽  
Sergey V. Pasechnik ◽  
Semen S. Kharlamov ◽  
Alexandre V. Zakharov ◽  
Eugeny P. Pozhidaev ◽  
...  
Keyword(s):  
Contact Angle ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Electric Fields ◽  
Capillary Flow ◽  
Capillary Rise ◽  
Vertical Plane ◽  
Treatment Technique ◽  
Photo Alignment ◽  
Wetting Process

In this paper we report the new experimental results on the rise of a liquid crystal in flat capillaries with inner photosensitive surfaces. The capillaries with different surface orientations were prepared by the use of the photo-alignment technique. Such a surface treatment makes it possible to eliminate the noncontrollable influence of a nanorelief on the wetting process, which takes place in the rubbing treatment technique previously used in similar experiments. The dynamics of the capillary rise of a nematic liquid crystal 5CB (4-cyano-4′-pentylbiphenyl) in vertical plane capillaries with photo-aligned substrates were studied for the first time. It was found that the stationary value of a contact angle weakly depends on the direction of a planar surface orientation relative to the direction of a capillary rise. It has been shown that the application of strong electric fields resulted in a decreasing of the contact angle. The results, obtained for the nematic liquid crystal, are compared with the results of an investigation of the capillary flow in a shock-free ferroelectric smectic phase.

scholarly journals Diffraction and Polarization Properties of Electrically–Tunable Nematic Liquid Crystal Grating

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1929 ◽  
Author(s):  
Shuan-Yu Huang ◽  
Bing-Yau Huang ◽  
Chi-Chung Kang ◽  
Chie-Tong Kuo
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Electric Fields ◽  
Applied Voltage ◽  
Incident Beam ◽  
Electrode Structure ◽  
First Order ◽  
External Electric Fields ◽  
Order Diffraction ◽  
Liquid Crystal Grating

This work demonstrates an electrically-tunable nematic liquid crystal (NLC) diffraction grating with a periodic electrode structure, and discusses the polarization properties of its diffraction. The efficiency of the first-order diffraction can be gradually controlled by applying external electric fields cross the NLC, and the maximum diffraction efficiency of the first-order diffraction that can be obtained is around 12.5% under the applied voltage of 5.0 V. In addition to the applied electric field, the efficiency of the first-order diffraction can also vary by changing the polarized state of the incident beam. Antisymmetric polarization states with symmetrical intensities in the diffractions corresponding to the +1 and −1 order diffraction signals are also demonstrated.

Optical Characterization of the Twisted Nematic Liquid Crystal Display

2009 ◽  
Vol 1242 ◽  
Author(s):  
Carolina Rickenstorff ◽  
A. S. Ostrovsky
Keyword(s):  
Liquid Crystal ◽  
Interference Pattern ◽  
Nematic Liquid Crystal ◽  
Phase Modulation ◽  
Liquid Crystal Display ◽  
Optical Characterization ◽  
Gray Level ◽  
Twisted Nematic ◽  
Twisted Nematic Liquid Crystal

ABSTRACTA simple optical characterization technique is developed for to find the amplitude and phase modulation modes for the twisted nematic liquid crystal display (TN-LCD). The developed technique is based on intensity and pixel shift measurements of the interference pattern obtained from the TN-LCD sandwiched between two polarizers in a modified Young's experiment. Particularly, specimen LC2002 Holoeye is characterized and its amplitude and phase modulation curves as a function of image's gray level, bright B and contrast C are presented.

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