Behaviour of photosensitive soft materials: Thermo-optical, dielectric and elastic constant studies on azo-dye doped nematic liquid crystals

2011 ◽  
Vol 130 (3) ◽  
pp. 1329-1335 ◽  
Author(s):  
S. Sridevi ◽  
Uma S. Hiremath ◽  
C.V. Yelamaggad ◽  
S. Krishna Prasad ◽  
Y.G. Marinov ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Elastic Constant ◽  
Azo Dye ◽  
Nematic Liquid Crystals ◽  
Soft Materials ◽  
Optical Dielectric

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.

Photoexcitation and diffusion of azo dye molecules in nematic liquid crystals

1998 ◽  
Author(s):  
Bendaoud Saad ◽  
Marie-Marguerite Denariez-Roberge ◽  
Tigran V. Galstian
Keyword(s):  
Liquid Crystals ◽  
Azo Dye ◽  
Nematic Liquid Crystals ◽  
Dye Molecules ◽  
And Diffusion

Two‐wavelength reversible holograms in azo‐dye doped nematic liquid crystals

1993 ◽  
Vol 62 (23) ◽  
pp. 2920-2922 ◽  
Author(s):  
Alan G. Chen ◽  
David J. Brady
Keyword(s):  
Liquid Crystals ◽  
Azo Dye ◽  
Nematic Liquid Crystals

Spontaneously Twisted Nonchiral Nematic Liquid Crystals

1990 ◽  
Vol 45 (6) ◽  
pp. 783-789 ◽  
Author(s):  
A. Chrzanowska
Keyword(s):  
Free Energy ◽  
Liquid Crystals ◽  
Elastic Constant ◽  
Nematic Liquid Crystals ◽  
Model Potential ◽  
Higher Order ◽  
Microscopic Model ◽  
Stability Conditions ◽  
Higher Order Terms ◽  
Potential Stability

AbstractNematic liquid crystals exhibiting a negative K2 elastic constant are discussed on the basis of a microscopic model potential. Stability conditions are satisfied by taking into account higher order terms in the expansion of the free energy. A continuous Freederiks effect is predicted for systems with negative K2.

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