Compact spectrophotometer using polarization-independent liquid crystal tunable optical filters

2007 ◽  
Author(s):  
Elena Nicolescu ◽  
Michael J. Escuti
Keyword(s):  
Liquid Crystal ◽  
Optical Filters ◽  
Tunable Optical Filters ◽  
Polarization Independent

scholarly journals Gradient pretilt angle alignment materials with different photosensitivity for tunable polarization‐independent self‐aligned liquid crystal lens

2021 ◽  
Author(s):  
Veronika S. Bezruchenko ◽  
Alexander A. Muravsky ◽  
Anatoli A. Murauski ◽  
Alexander I. Stankevich ◽  
Uladzimir V. Mahilny
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Lens ◽  
Polarization Independent ◽  
Pretilt Angle

scholarly journals Polymer Dispersed Cholesteric Liquid Crystals With a Toroidal Director Configuration under an Electric Field

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 732
Author(s):  
Anna P. Gardymova ◽  
Mikhail N. Krakhalev ◽  
Victor Ya. Zyryanov ◽  
Alexandra A. Gruzdenko ◽  
Andrey A. Alekseev ◽  
...  
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Electric Field ◽  
Point Defects ◽  
Structural Response ◽  
Optical Filters ◽  
Response Curves ◽  
Polymer Dispersed Liquid Crystal ◽  
Dichroic Dye ◽  
Polymer Dispersed

The electro-optical properties of polymer dispersed liquid crystal (PDLC) films are highly dependent on the features of the contained liquid crystal (LC) droplets. Cholesteric LC droplets with homeotropic boundaries can form several topologically different orientational structures, including ones with single and more point defects, layer-like, and axisymmetric twisted toroidal structures. These structures are very sensitive to an applied electric field. In this work, we have demonstrated experimentally and by computer simulations that twisted toroidal droplets reveal strong structural response to the electric field. In turn, this leads to vivid changes in the optical texture in crossed polarizers. The response of droplets of different sizes were found to be equivalent in terms of dimensionless parameters. In addition, the explanation of this phenomenon showed a comparison of theoretical and experimental structural response curves aids to determine the shape of the droplet. Finally, we demonstrated that the addition of a dichroic dye allows such films to be used as optical filters with adjustable color even without polarizers.

Tunable optical filters based on photorefractive holographic gratings

2003 ◽  
Author(s):  
Victor M. Petrov ◽  
A. V. Chamrai ◽  
J. Petter ◽  
T. Tchudi ◽  
M. P. Petrov
Keyword(s):  
Optical Filters ◽  
Holographic Gratings ◽  
Tunable Optical Filters
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