scholarly journals Magnetically tunable optical diffraction gratings based on a ferromagnetic liquid crystal

2019 ◽  
Vol 27 (6) ◽  
pp. 8900 ◽  
Author(s):  
S. Gao ◽  
M. Fleisch ◽  
R. A. Rupp ◽  
L. Cmok ◽  
P. Medle-Rupnik ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Diffraction Gratings ◽  
Optical Diffraction

scholarly journals Design of Tunable Holographic Liquid Crystalline Diffraction Gratings

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6789
Author(s):  
Katarzyna A. Rutkowska ◽  
Anna Kozanecka-Szmigiel
Keyword(s):  
Liquid Crystal ◽  
Communication Networks ◽  
Optical Communication ◽  
Liquid Crystalline ◽  
Incident Light ◽  
Diffraction Gratings ◽  
Lagrange Equations ◽  
Experimental Conditions ◽  
Molecular Distribution ◽  
Polarization Gratings

Tunable diffraction gratings and phase filters are important functional devices in optical communication and sensing systems. Polarization gratings, in particular, capable of redirecting an incident light beam completely into the first diffraction orders may be successfully fabricated in liquid crystalline cells assembled from substrates coated with uniform transparent electrodes and orienting layers that force a specific molecular distribution. In this work, the diffraction properties of liquid crystal (LC) cells characterized by a continually rotating cycloidal director pattern at the cell substrates and in the bulk, are studied theoretically by solving a relevant set of the Euler-Lagrange equations. The electric tunability of the gratings is analyzed by estimating the changes in liquid crystalline molecular distribution and thus in effective birefringence, as a function of external voltage. To the best of our knowledge, such detailed numerical calculations have not been presented so far for liquid crystal polarization gratings showing a cycloidal director pattern. Our theoretical predictions may be easily achieved in experimental conditions when exploiting, for example, photo-orienting material, to induce a permanent LC alignment with high spatial resolution. The proposed design may be for example, used as a tunable passband filter with adjustable bandwidths, thus allowing for potential applications in optical spectroscopy, optical communication networks, remote sensing and beyond.

Polarization characteristics of polymer-liquid-crystal diffraction gratings

2008 ◽  
Vol 75 (8) ◽  
pp. 514 ◽  
Author(s):  
G. M. Zharkova ◽  
A. P. Petrov ◽  
I. V. Samsonova ◽  
S. A. Strel'tsov ◽  
V. M. Khachaturyan
Keyword(s):  
Liquid Crystal ◽  
Diffraction Gratings ◽  
Polymer Liquid ◽  
Polarization Characteristics ◽  
Polymer Liquid Crystal

Photopatterned azo poly(amide imide) layers as aligning substrates of holographic liquid crystal diffraction gratings for beam steering applications

2020 ◽  
Vol 8 (3) ◽  
pp. 968-976 ◽  
Author(s):  
Anna Kozanecka-Szmigiel ◽  
Katarzyna A. Rutkowska ◽  
Mateusz Nieborek ◽  
Michal Kwasny ◽  
Miroslaw A. Karpierz ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Light Beam ◽  
Beam Steering ◽  
Diffraction Gratings ◽  
Photonic Device

Custom synthesized “T-type” azobenzene-functionalized poly(amide imide) allows for effective fabrication of a tunable liquid crystal photonic device for light beam steering.

Asymmetric transmissive behavior of liquid-crystal diffraction gratings

2001 ◽  
Vol 26 (15) ◽  
pp. 1188 ◽  
Author(s):  
C. M. Titus ◽  
J. R. Kelly ◽  
E. C. Gartland ◽  
S. V. Shiyanovskii ◽  
J. A. Anderson ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Diffraction Gratings
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