Photorefractivity and Holographic Storage Effect in Fullerene C60-Doped Nematic Liquid Crystals

1996 ◽  
Vol 425 ◽  
Author(s):  
I. C. Khoo ◽  
M. V. Wood ◽  
Brett D. Guenther
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nematic Liquid Crystal ◽  
Fullerene C60 ◽  
Diffraction Effect ◽  
Storage Effect ◽  
Optical Effect ◽  
Holographic Storage ◽  
Electro Optical Effect ◽  
Crystal Film

Abstract:The results of a recent study of a nonlinear electro-optical effect in fullerene C60-doped nematic liquid crystal film are presented. In particular, photo-induced conduction, self diffraction effect, and permanent holographic formation in the films are explained.

Active Photonic Crystals Based multiplexer

2006 ◽  
Vol 934 ◽  
Author(s):  
Principia Dardano ◽  
Vito Mocella ◽  
Luigi Sirleto ◽  
Luigi Moretti ◽  
Ivo Rendina
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Photonic Crystal ◽  
Photonic Crystals ◽  
Square Lattice ◽  
Two Dimensional ◽  
Optical Effect ◽  
Electro Optical Effect ◽  
Silicon Rods

ABSTRACTIn the last years, in order to achieve active tuning of photonic crystals devices, the possibility to use liquid crystal inside photonic crystals has been explored.On this line of argument, in this paper, we numerically investigate a tunable T-shaped waveguide diplexer, based on a two-dimensional square lattice photonic crystal composed of silicon rods in a liquid crystals. We prove that complete splitting of the entire input wavelengths range in two sub-ranges symmetrical with respect to the middle (switching) wavelength, and propagating in right and left arms respectively, can be achieved. Moreover, changing the refractive index of liquid crystals by electro-optical effect, a tuning of switching wavelength of about 60 nm can be obtained.

New structure induced by elastic anisotropy in cylindrical nematic liquid crystal

2017 ◽  
Vol 13 (2) ◽  
pp. 4705-4717
Author(s):  
Zhang Qian ◽  
Zhou Xuan ◽  
Zhang Zhidong
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nematic Liquid Crystal ◽  
Elastic Anisotropy ◽  
Nematic Liquid Crystals ◽  
Gennes Theory

Basing on Landau–de Gennes theory, this study investigated the chiral configurations of nematic liquid crystals confined to cylindrical capillaries with homeotropic anchoring on the cylinder walls. When the elastic anisotropy (L2/L1) is large enough, a new structure results from the convergence of two opposite escape directions of the heterochiral twist and escape radial (TER) configurations. The new defect presents when L2/L1≥7 and disappears when L2/L1<7. The new structure possesses a heterochiral hyperbolic defect at the center and two homochiral radial defects on both sides. The two radial defects show different chiralities.

Defects in Nematic Liquid Crystal Film with Geometric Grooves

2015 ◽  
Vol 13 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Xiao-Ji Li ◽  
Zhi-Dong Zhang
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Crystal Film
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