Surface alignment of ferroelectric nematic liquid crystals

Soft Matter ◽  
2021 ◽  
Author(s):  
Federico Caimi ◽  
Giovanni Nava ◽  
Raouf Barboza ◽  
Noel A Clark ◽  
Eva Korblova ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Electric Fields ◽  
Nematic Liquid Crystals ◽  
Surface Alignment ◽  
Optical Applications

The success of nematic liquid crystals in displays and optical applications is due to the combination of their optical uniaxiality, fluidity, elasticity, responsiveness to electric fields and controllable coupling of...

scholarly journals Electrically Controlled Diffraction Grating in Azo Dye-Doped Liquid Crystals

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1051 ◽  
Author(s):  
Chuen-Lin Tien ◽  
Rong-Ji Lin ◽  
Chi-Chung Kang ◽  
Bing-Yau Huang ◽  
Chie-Tong Kuo ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Electric Fields ◽  
Azo Dye ◽  
Nematic Liquid Crystals ◽  
Polarized Light ◽  
Dielectric Anisotropy ◽  
Linear Effect ◽  
Periodic Distribution ◽  
The Difference

This research applies the non-linear effect of azo dye-doped liquid crystal materials to develop a small, simple, and adjustable beam-splitting component with grating-like electrodes. Due to the dielectric anisotropy and optical birefringence of nematic liquid crystals, the director of the liquid crystal molecules can be reoriented by applying external electric fields, causing a periodic distribution of refractive indices and resulting in a diffraction phenomenon when a linearly polarized light is introduced. The study also discusses the difference in the refractive index (Δn), the concentration of azo dye, and the rising constant depending on the diffraction signals. The experimental results show that first-order diffraction efficiency can reach ~18% with 0.5 wt % azo dye (DR-1) doped in the nematic liquid crystals.

Behaviour of Nematic Liquid Crystals in Inhomogeneous Electric Fields

1979 ◽  
Vol 55 (1) ◽  
pp. 193-207 ◽  
Author(s):  
V. G. Chigrinov ◽  
I. N. Kompanets ◽  
A. A. Vasiliev
Keyword(s):  
Liquid Crystals ◽  
Electric Fields ◽  
Nematic Liquid Crystals

scholarly journals Patterns driven by combined ac and dc electric fields in nematic liquid crystals

2014 ◽  
Vol 89 (5) ◽  
Author(s):  
Alexei Krekhov ◽  
Werner Decker ◽  
Werner Pesch ◽  
Nándor Éber ◽  
Péter Salamon ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Electric Fields ◽  
Nematic Liquid Crystals ◽  
Dc Electric Fields

Nematic liquid crystals in frequency and amplitude modulated electric fields

2001 ◽  
Vol 28 (7) ◽  
pp. 973-982 ◽  
Author(s):  
B. I. Lev ◽  
V. N. Sergienko ◽  
P. M. Tomchuk ◽  
E. K. Frolova
Keyword(s):  
Liquid Crystals ◽  
Electric Fields ◽  
Nematic Liquid Crystals

A Novel Method for Measuring the Difference in Flexoelectric Coefficients of Nematic Liquid Crystals

2011 ◽  
Vol 181-182 ◽  
pp. 26-32
Author(s):  
Benjamin I. Outram ◽  
Steve J. Elston
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nematic Liquid Crystal ◽  
Electric Fields ◽  
Nematic Liquid Crystals ◽  
Angle Of Incidence ◽  
Rotation Method ◽  
Twisted Nematic ◽  
Novel Method ◽  
The Difference

The difference between e1 and e3 parameters for flexoelectric polarization, as originally defined byMeyer, is measured for nematic liquid crystal materials E7 and BL087 in Twisted Nematic (TN) cells with In-Plane Switching (IPS) electric fields using the crystal rotation method, which measures transmission as a function of angle of incidence. Values of e1 − e3 for E7 and BL087 are found to be 7.2±1.0 pCm−1 and 9.4±1.0 pCm−1 respectively.

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