INFLUENCE OF HYDRODYNAMIC FLOWS ON THE OPTICAL PROPERTIES OF HYBRID ALIGNED NEMATIC LIQUID CRYSTALS

2018 ◽  
Vol 52 (3 (247)) ◽  
pp. 213-216
Author(s):  
K.A. Petrosyan
Keyword(s):  
Optical Properties ◽  
Angular Distribution ◽  
Liquid Crystals ◽  
Flow Velocity ◽  
Volume Expansion ◽  
Nematic Liquid Crystals ◽  
Polarized Light ◽  
Hydrodynamic Flow ◽  
Light Passing ◽  
Expansion Mechanism

In this work we study the influence of hydrodynamic flows on the optical properties of hybrid aligned nematic liquid crystals (NLC) structure caused by direct volume expansion mechanism for the case, when the direction of flow velocity is perpendicular to the angular distribution of the molecules in the cell. It has been shown that the hydrodynamic flow leads to reorientation of NLC molecules. The behavior of the polarized light passing through the NLC layer for two opposite directions of the flow was observed.

Light-induced hydrodynamic reorientation of hybrid aligned nematic liquid crystals caused by direct volume expansion

2018 ◽  
Vol 46 (5) ◽  
pp. 694-699
Author(s):  
T. Dadalyan ◽  
K. Petrosyan ◽  
R. Alaverdyan ◽  
R. Hakobyan
Keyword(s):  
Liquid Crystals ◽  
Volume Expansion ◽  
Nematic Liquid Crystals

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.

scholarly journals Optical Properties of Aligned Nematic Liquid Crystals in Electric Field

2011 ◽  
Vol 02 (04) ◽  
pp. 248-255 ◽  
Author(s):  
Suleyman Yilmaz ◽  
Halide Melik ◽  
Firat Angay ◽  
Mehriban Emek ◽  
Ahmet Yildirim
Keyword(s):  
Optical Properties ◽  
Liquid Crystals ◽  
Electric Field ◽  
Nematic Liquid Crystals

Optical properties study on some nematic liquid crystals in the terahertz range

2010 ◽  
Author(s):  
Huijuan Sun ◽  
Qingli Zhou ◽  
Yulei Shi ◽  
Dongmei Zhao ◽  
Cunlin Zhang
Keyword(s):  
Optical Properties ◽  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Terahertz Range
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