Caracterización de un holograma mediante el dopaje de un PDLC con violeta de genciana

Se propone la utilización de un dispositivo PDLC (Polymer Dispersed Liquid-Crystal) dopado con violeta de genciana para su utilización en el grabado de rejillas holográficas (H-PDLC). Se muestra el comportamiento de la eficiencia de difracción de rejillas holográficas grabadas en un H-PDLC con un espesor de 10 µm. El proceso de grabado se lleva a cabo por la modulación del índice de refracción del H-PDLC al ser expuesto a un patrón de luz. La eficiencia máxima que alcanza este dispositivo es del 5% medido en el orden 1 de difracción. Este dispositivo promete ser un buen material para funcionar como alternativa de las películas holográficas.

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

Polymers ◽

10.3390/polym13050732 ◽

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 ◽

Dichroic Dye ◽

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.

Study on the electro-optical properties of epoxy resin based polymer dispersed liquid crystal films

Molecular Crystals and Liquid Crystals ◽

10.1080/15421406.2018.1554754 ◽

2021 ◽

pp. 1-7

Author(s):

Yuzhen Zhao ◽

Zemin He ◽

Quanzhi Ban ◽

Kexuan Li ◽

Siyi Ding ◽

...

Keyword(s):

Optical Properties ◽

Liquid Crystal ◽

Epoxy Resin ◽

Liquid Crystal Films ◽

Crystal Films ◽

2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666) ◽

Wavelength-tuneable C-band nano polymer dispersed liquid crystal vertical-cavity surface-emitting laser

10.1109/cleoe.2003.1312196 ◽

2004 ◽

Cited By ~ 1

Author(s):

V. Verbrugge ◽

J.-L. de Bongrenet ◽

de la Tocnaye ◽

L. Dupont ◽

L. Plouzennec ◽

...

Keyword(s):

Liquid Crystal ◽

Cavity Surface ◽

Polymer Dispersed ◽

Vertical Cavity Surface ◽

Surface Emitting Laser ◽

Vertical Cavity

Thermally and electrically switchable gratings based on polymer-ball-type polymer-dispersed liquid-crystal films

Applied Optics ◽

10.1364/ao.41.004585 ◽

2002 ◽

Vol 41 (22) ◽

pp. 4585 ◽

Cited By ~ 19

Author(s):

Andy Ying-Guey Fuh ◽

Chia-Rong Lee ◽

Ya-Hui Ho

Keyword(s):

Liquid Crystal ◽

Liquid Crystal Films ◽

Crystal Films ◽

Kinetics of Droplet Formation in UV-Cured Polymer-Dispersed Liquid Crystal Films

Japanese Journal of Applied Physics ◽

10.1143/jjap.33.2641 ◽

1994 ◽

Vol 33 (Part 1, No. 5A) ◽

pp. 2641-2647 ◽

Cited By ~ 13

Author(s):

Vasilii G. Nazarenko ◽

Seshu Sarala ◽

Nelamangala V. Madhusudana

Keyword(s):

Liquid Crystal ◽

Droplet Formation ◽

Liquid Crystal Films ◽

Crystal Films ◽

Polymer Dispersed ◽

Kinetics Of

Holographic Polymer-Dispersed Liquid Crystals: Materials, Formation, and Applications

Advances in OptoElectronics ◽

10.1155/2008/684349 ◽

2008 ◽

Vol 2008 ◽

pp. 1-52 ◽

Cited By ~ 56

Author(s):

Y. J. Liu ◽

X. W. Sun

Keyword(s):

Liquid Crystal ◽

Liquid Crystals ◽

Refractive Index Profile ◽

Single Step ◽

Fast Switching ◽

Current State ◽

Index Matching ◽

Polymer Dispersed ◽

Materials Used

By combining polymer-dispersed liquid crystal (PDLC) and holography, holographic PDLC (H-PDLC) has emerged as a new composite material for switchable or tunable optical devices. Generally, H-PDLC structures are created in a liquid crystal cell filled with polymer-dispersed liquid crystal materials by recording the interference pattern generated by two or more coherent laser beams which is a fast and single-step fabrication. With a relatively ideal phase separation between liquid crystals and polymers, periodic refractive index profile is formed in the cell and thus light can be diffracted. Under a suitable electric field, the light diffraction behavior disappears due to the index matching between liquid crystals and polymers. H-PDLCs show a fast switching time due to the small size of the liquid crystal droplets. So far, H-PDLCs have been applied in many promising applications in photonics, such as flat panel displays, switchable gratings, switchable lasers, switchable microlenses, and switchable photonic crystals. In this paper, we review the current state-of-the-art of H-PDLCs including the materials used to date, the grating formation dynamics and simulations, the optimization of electro-optical properties, the photonic applications, and the issues existed in H-PDLCs.