scholarly journals Effects of flow on topological defects in a nematic liquid crystal near a colloid

2014 ◽  
Vol 140 (5) ◽  
pp. 054905 ◽  
Author(s):  
Tillmann Stieger ◽  
Martin Schoen ◽  
Marco G. Mazza
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Topological Defects

scholarly journals Vortices Nucleation By Inherent Fluctuations In Nematic Liquid Crystal Cells

2021 ◽  
Author(s):  
Esteban Aguilera ◽  
Marcel G. Clerc ◽  
Valeska Zambra
Keyword(s):  
Liquid Crystal ◽  
Optical Tweezers ◽  
Nematic Liquid Crystal ◽  
Topological Defects ◽  
Optical Vortices ◽  
Topological Features ◽  
Nucleation Mechanisms ◽  
Multistable Systems ◽  
Light Beams ◽  
Crystal Cells

Abstract Multistable systems are characterized by exhibiting domain coexistence, where each domain accounts for the different states. In the case of these systems are described by vectorial fields, domains are connected through topological defects. Vortices are one of the most frequent and studied topological defect points. Optical vortices are equally relevant for their fundamental features as beams with topological features and their applications in image processing, telecommunications, optical tweezers, and quantum information. The interaction of light beams with matter vortices in liquid crystal cells is a natural source of optical vortices. The rhythms that govern the emergence of matter vortexes due to fluctuations are not established. Here we investigate the nucleation mechanisms of the matter vortices in liquid crystal cells and establish statistical laws that govern them. Based on a stochastic amplitude equation, the law for the number of nucleated vortices as a function of anisotropy, voltage, and noise level intensity is set. Experimental observations in a nematic liquid crystal cell with homeotropic anchoring and a negative anisotropic dielectric constant under the influence of a transversal electric field show a fair agreement with the theoretical findings.

scholarly journals Tunable two-dimensional polarization grating using a self-organized micropixelated liquid crystal structure

RSC Advances ◽  
2018 ◽  
Vol 8 (72) ◽  
pp. 41472-41479 ◽  
Author(s):  
Reo Amano ◽  
Péter Salamon ◽  
Shunsuke Yokokawa ◽  
Fumiaki Kobayashi ◽  
Yuji Sasaki ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Topological Defects ◽  
Self Organization ◽  
Two Dimensional ◽  
Self Organized ◽  
Optical Grating ◽  
Liquid Crystal Structure ◽  
Polarization Grating

A micro-pixelated pattern of a nematic liquid crystal formed by self-organization of topological defects is shown to work as a tunable two-dimensional optical grating.

Friction Drag on a Cylinder Moving in a Nematic Liquid Crystal

1995 ◽  
Vol 50 (11) ◽  
pp. 1023-1030 ◽  
Author(s):  
R. W. Ruhwandl ◽  
E. M. Terentjev
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Drag Force ◽  
Particle Surface ◽  
Topological Defects ◽  
The Body ◽  
Friction Drag ◽  
Director Field ◽  
Moving Body ◽  
Clearing Point

Abstract The flow of a liquid crystal around a body depends not only on the geometry of the body but also on the director field around it. For low-Ericksen number flows, the director distribution largely remains in its static equilibrium texture (along a uniform direction far away from the body and, for instance, perpendicular to its surface). We calculate the velocity and pressure of a cylinder in a nematic flow numerically, taking into account topological defects on the particle surface and find the drag force acting on the moving body. The drag force is, in general, non-central, i.e. not aligned with the direction of motion. The lift component of the drag force is a measure for the anisotropy of the system. We show that due to the realistic director texture the drag force is larger than previously thought and the anisotropy, FII/F^, smaller and decreasing while approaching the nematic clearing point.

Simulations of Topological Defects in Nematic Liquid Crystal Films

2003 ◽  
Vol 398 (1) ◽  
pp. 195-206 ◽  
Author(s):  
Cesare Chiccoli ◽  
Paolo Pasini ◽  
Ivan Feruli ◽  
Claudio Zannoni
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Topological Defects ◽  
Liquid Crystal Films ◽  
Crystal Films

scholarly journals Co-revolving topological defects in a nematic liquid crystal

Soft Matter ◽  
2021 ◽  
Author(s):  
Adam L. Susser ◽  
Samo Kralj ◽  
Charles Rosenblatt
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Surface Defect ◽  
Surface Defects ◽  
Topological Defects ◽  
Patterned Surface

A patterned surface defect of strength m = +1 and its associated disclination lines can decompose into a pair of surface defects and disclination lines of strength m = +1/2. Black bar represents 10 μm.

scholarly journals Uncovering different states of topological defects in schlieren textures of a nematic liquid crystal

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Takuya Ohzono ◽  
Kaoru Katoh ◽  
Chenguang Wang ◽  
Aiko Fukazawa ◽  
Shigehiro Yamaguchi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Topological Defects
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