Experimental study of laser-induced thermomechanical effect and new type of orientational optical nonlinearity in twist aligned nematic liquid crystal

2010 ◽  
Author(s):  
G. S. Gevorgyan ◽  
A. A. Kirakosyan ◽  
R. B. Alaverdyan ◽  
R. S. Hakobyan
Keyword(s):  
Experimental Study ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Optical Nonlinearity ◽  
Thermomechanical Effect ◽  
New Type

LASER-INDUCED THERMOMECHANICAL EFFECTS IN NEMATIC LIQUID-CRYSTAL

2012 ◽  
Vol 15 ◽  
pp. 120-128
Author(s):  
A.K. ALEKSANYAN ◽  
G.S. GEVORGYAN ◽  
R.S. HAKOBYAN ◽  
R.B. ALAVERDYAN
Keyword(s):  
Liquid Crystal ◽  
Laser Beam ◽  
Nematic Liquid Crystal ◽  
Normal Incidence ◽  
Optical Nonlinearity ◽  
Angle Of Incidence ◽  
Absorbed Energy ◽  
The Third ◽  
Thermomechanical Effect ◽  
Thermomechanical Effects

As we know there are several mechanisms allowing us to convert absorbed energy by liquid crystal (LC) to the energy of reorientation of director. One of them is the third thermomechanical effect. Third thermomechanical effect induced by Gaussian beam was recently studied both theoretically and experimentally. It was shown that thermomechanical effects can decrease the threshold of Fréedericksz transition in dye-doped nematic liquid crystal (NLC). One of the big advantages of thermomechanical effect compared with other mechanisms (for instance giant optical nonlinearity (GON)), which are absent in the case of normal incidence of laser beam, is that it emerges at any angle of incidence of laser beam. Thermomechanical effects were also studied in NLC, containing azobenzene in their molecular structure. It was suggested that one of the mechanisms of optical nonlinearity observed in the experiment in such medium may be the thermomechanical effect.

Orientation, interaction and laser assisted self-assembly of organic single-crystal micro-sheets in a nematic liquid crystal

Soft Matter ◽  
2015 ◽  
Vol 11 (38) ◽  
pp. 7674-7679 ◽  
Author(s):  
M. V. Rasna ◽  
K. P. Zuhail ◽  
U. V. Ramudu ◽  
R. Chandrasekar ◽  
J. Dontabhaktuni ◽  
...  
Keyword(s):  
Experimental Study ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Single Crystal ◽  
Nematic Liquid Crystal ◽  
Self Assembly ◽  
Nematic Liquid Crystals ◽  
Directed Assembly ◽  
Orientation Interaction ◽  
Organic Single Crystal

In this paper we report first experimental study on the orientation, interaction and directed-assembly of single crystal micro-sheets in nematic liquid crystals.

High optical nonlinearity of nematic liquid crystal doped with graphen oxide

2017 ◽  
Vol 244 ◽  
pp. 103-109 ◽  
Author(s):  
Nima Dalir ◽  
Soheila Javadian ◽  
Zahra Dehghani
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Optical Nonlinearity

Polarizing Optical Microscopic Characterization of Nematic Liquid Crystal Confined in Porous Silicon

2011 ◽  
Vol 181-182 ◽  
pp. 83-87
Author(s):  
Yuan Ming Huang ◽  
Qing Lan Ma ◽  
Bao Gai Zhai
Keyword(s):  
Experimental Study ◽  
Liquid Crystal ◽  
Porous Silicon ◽  
Optical Microscopy ◽  
Nematic Liquid Crystal ◽  
Experimental Investigations ◽  
Electro Optic ◽  
The Given

With polarizing optical microscopy we have investigated the electro-optic properties of a nematic liquid crystal 4-n-pentyl-4′-cyanobipheny confined in the microchannels of porous silicon. Experimental study shows clearly that the liquid crystal molecules tend to align parallel to the direction of the pore columns in porous silicon. Schlieren textures with S = +1 and +2 disclinations were recorded. Our experimental investigations show that uniaxial alignment, the planar radial and the escaped radial configurations exist around the given microchannels of porous silicon.

Experimental study on terahertz metamaterial embedded in nematic liquid crystal

2015 ◽  
Vol 106 (9) ◽  
pp. 092905 ◽  
Author(s):  
Rafał Kowerdziej ◽  
Leszek Jaroszewicz ◽  
Marek Olifierczuk ◽  
Janusz Parka
Keyword(s):  
Experimental Study ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal
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