HOLOGRAPHIC GRATING DESIGNED FOR THE STABILITY CONTROL OF AN ACTIVE INTERFEROMETRIC SETUP

2011 ◽  
Vol 20 (01) ◽  
pp. 15-21 ◽  
Author(s):  
LUCIANO DE SIO ◽  
ALESSANDRO VELTRI ◽  
CESARE UMETON
Keyword(s):  
Liquid Crystal ◽  
Interference Pattern ◽  
Nematic Liquid Crystal ◽  
Low Cost ◽  
Feedback System ◽  
Stability Control ◽  
Holographic Grating ◽  
Transmission Grating ◽  
Active Feedback ◽  
The Stability

We report on the design of a particular holographic grating to be exploited for the stability control of an active optical holographic setup. The low-cost transmission grating made of alternating slices of pure polymer slices and pure nematic liquid crystal is used as a reference grating for the active feedback system that enables the interference patterns stabilization. The stability test of the interference pattern confirms the effectiveness of the proposed technique.

Optical Characterization of the Twisted Nematic Liquid Crystal Display

2009 ◽  
Vol 1242 ◽  
Author(s):  
Carolina Rickenstorff ◽  
A. S. Ostrovsky
Keyword(s):  
Liquid Crystal ◽  
Interference Pattern ◽  
Nematic Liquid Crystal ◽  
Phase Modulation ◽  
Liquid Crystal Display ◽  
Optical Characterization ◽  
Gray Level ◽  
Twisted Nematic ◽  
Twisted Nematic Liquid Crystal

ABSTRACTA simple optical characterization technique is developed for to find the amplitude and phase modulation modes for the twisted nematic liquid crystal display (TN-LCD). The developed technique is based on intensity and pixel shift measurements of the interference pattern obtained from the TN-LCD sandwiched between two polarizers in a modified Young's experiment. Particularly, specimen LC2002 Holoeye is characterized and its amplitude and phase modulation curves as a function of image's gray level, bright B and contrast C are presented.

Asymmetric dynamic phase holographic grating in nematic liquid crystal

2016 ◽  
Vol 25 (9) ◽  
pp. 094218
Author(s):  
Chang-Yu Ren ◽  
Hong-Xin Shi ◽  
Yan-Bao Ai ◽  
Xiang-Bao Yin ◽  
Feng Wang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Holographic Grating ◽  
Dynamic Phase

scholarly journals On the stability of two nematic liquid crystal configurations

2002 ◽  
Vol 2 (4) ◽  
pp. 561-574
Author(s):  
Bagisa Mukherjee ◽  
◽  
Chun Liu ◽  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
The Stability

scholarly journals The rise of Newtonian drops in a nematic liquid crystal

2007 ◽  
Vol 593 ◽  
pp. 385-404 ◽  
Author(s):  
CHUNFENG ZHOU ◽  
PENGTAO YUE ◽  
JAMES J. FENG
Keyword(s):  
Liquid Crystal ◽  
Flow Field ◽  
Point Defect ◽  
Nematic Liquid Crystal ◽  
Topological Defects ◽  
Diffuse Interface ◽  
Initial Surface ◽  
Surface Anchoring ◽  
Moving Interface ◽  
The Stability

We simulate the rise of Newtonian drops in a nematic liquid crystal parallel to the far-field molecular orientation. The moving interface is computed in a diffuse-interface framework, and the anisotropic rheology of the liquid crystal is represented by the Leslie–Ericksen theory, regularized to permit topological defects. Results reveal interesting coupling between the flow field and the orientational field surrounding the drop, especially the defect configuration. The flow generally sweeps the point and ring defects downstream, and may transform a ring defect into a point defect. The stability of these defects and their transformation are depicted in a phase diagram in terms of the Ericksen number and the ratio between surface anchoring and bulk elastic energies. The nematic orientation affects the flow field in return. Drops with planar anchoring on the surface rise faster than those with homeotropic anchoring, and the former features a vortex ring in the wake. These are attributed to the viscous anisotropy of the nematic. With homeotropic anchoring, the drop rising velocity experiences an overshoot, owing to the transformation of the initial surface ring defect to a satellite point defect. With both types of anchoring, the drag coefficient of the drop decreases with increasing Ericksen number as the flow-alignment of the nematic orientation reduces the effective viscosity of the liquid crystal.

Influence of nematic liquid crystal with dye and cell construction parameters on dynamic holographic grating formation

2000 ◽  
Author(s):  
Janusz Parka ◽  
Andrzej Miniewicz ◽  
A. Januszko ◽  
Yuri A. Reznikov ◽  
Roman S. Dabrowski ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Holographic Grating ◽  
Grating Formation ◽  
Cell Construction
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