Optical nonlinearities induced by electric fields in nematic liquid crystals

2015 ◽  
Author(s):  
Victor Stoian ◽  
Cristina Cîirtoaje ◽  
Emil Petrescu ◽  
Cornelia Moţoc
Keyword(s):  
Liquid Crystals ◽  
Electric Fields ◽  
Nematic Liquid Crystals ◽  
Optical Nonlinearities

scholarly journals Electrically Controlled Diffraction Grating in Azo Dye-Doped Liquid Crystals

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1051 ◽  
Author(s):  
Chuen-Lin Tien ◽  
Rong-Ji Lin ◽  
Chi-Chung Kang ◽  
Bing-Yau Huang ◽  
Chie-Tong Kuo ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Electric Fields ◽  
Azo Dye ◽  
Nematic Liquid Crystals ◽  
Polarized Light ◽  
Dielectric Anisotropy ◽  
Linear Effect ◽  
Periodic Distribution ◽  
The Difference

This research applies the non-linear effect of azo dye-doped liquid crystal materials to develop a small, simple, and adjustable beam-splitting component with grating-like electrodes. Due to the dielectric anisotropy and optical birefringence of nematic liquid crystals, the director of the liquid crystal molecules can be reoriented by applying external electric fields, causing a periodic distribution of refractive indices and resulting in a diffraction phenomenon when a linearly polarized light is introduced. The study also discusses the difference in the refractive index (Δn), the concentration of azo dye, and the rising constant depending on the diffraction signals. The experimental results show that first-order diffraction efficiency can reach ~18% with 0.5 wt % azo dye (DR-1) doped in the nematic liquid crystals.

NONLINEAR AND ELECTRO-OPTICS OF NANO-DISPERSED NEMATIC LIQUID CRYSTALS WITH TUNABLE NEGATIVE-, ZERO-, AND POSITIVE INDICES

2007 ◽  
Vol 16 (03) ◽  
pp. 381-399 ◽  
Author(s):  
I. C. KHOO ◽  
A. DIAZ ◽  
D. KWON ◽  
D. H. WERNER ◽  
J. LIOU ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Response Times ◽  
Nematic Liquid Crystals ◽  
Optical Nonlinearity ◽  
Frequency Selective Surfaces ◽  
Optical Nonlinearities ◽  
Crystal Matrix ◽  
Liquid Crystal Matrix ◽  
Positive Index

We present a review of recent progress in the studies of the nonlinear- and electro-optics of liquid crystals, particularly in their meta-material forms. An analytical expression for the "ultimate" optical nonlinearity of nematic liquid crystals is obtained, and several routes to realizing such optical nonlinearities are discussed. We also describe two approaches for realizing tunable or reconfigurable negative-zero-positive index materials: (1) planar nano-structured frequency selective surfaces [FSS] containing nematic liquid crystals; (2) core-shell nano-spheres randomly distributed in bulk nematic liquid crystal matrix. Such metamaterials can be designed for applications in the visible-infrared, as well as Terahertz and microwave regimes. These liquid crystalline meta-materials are capable of supra-nonlinearities characterized by refractive index changing coefficients of over 1 cm2/watt and microseconds response times.

Behaviour of Nematic Liquid Crystals in Inhomogeneous Electric Fields

1979 ◽  
Vol 55 (1) ◽  
pp. 193-207 ◽  
Author(s):  
V. G. Chigrinov ◽  
I. N. Kompanets ◽  
A. A. Vasiliev
Keyword(s):  
Liquid Crystals ◽  
Electric Fields ◽  
Nematic Liquid Crystals

scholarly journals Patterns driven by combined ac and dc electric fields in nematic liquid crystals

2014 ◽  
Vol 89 (5) ◽  
Author(s):  
Alexei Krekhov ◽  
Werner Decker ◽  
Werner Pesch ◽  
Nándor Éber ◽  
Péter Salamon ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Electric Fields ◽  
Nematic Liquid Crystals ◽  
Dc Electric Fields

Nematic liquid crystals in frequency and amplitude modulated electric fields

2001 ◽  
Vol 28 (7) ◽  
pp. 973-982 ◽  
Author(s):  
B. I. Lev ◽  
V. N. Sergienko ◽  
P. M. Tomchuk ◽  
E. K. Frolova
Keyword(s):  
Liquid Crystals ◽  
Electric Fields ◽  
Nematic Liquid Crystals
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