scholarly journals Simple Optical Methods for Measuring Optical Nonlinearities and Rotational Viscosity in Nematic Liquid Crystals

10.5772/9683 ◽  
2009 ◽  
Author(s):  
Gun Yeup ◽  
Chong Hoon
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Optical Methods ◽  
Optical Nonlinearities ◽  
Rotational Viscosity

Determination of the rotational viscosity of nematic liquid crystals over an extended range

1988 ◽  
Vol 3 (2) ◽  
pp. 217-224 ◽  
Author(s):  
F.-J. Bock ◽  
H. Kneppe ◽  
F. Schneider
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Extended Range ◽  
Rotational Viscosity

Universal law for the rotational viscosity of nematic liquid crystals

1982 ◽  
Vol 26 (5) ◽  
pp. 2940-2945 ◽  
Author(s):  
Hp. Schad ◽  
H. R. Zeller
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Rotational Viscosity ◽  
Universal Law

Special optical geometry for measuring twist elastic module K22 and rotational viscosity γ1 of nematic liquid crystals

2009 ◽  
Vol 94 (18) ◽  
pp. 181910 ◽  
Author(s):  
A. V. Dubtsov ◽  
S. V. Pasechnik ◽  
D. V. Shmeliova ◽  
V. A. Tsvetkov ◽  
V. G. Chigrinov
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Optical Geometry ◽  
Elastic Module ◽  
Rotational Viscosity

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.

Shear and rotational viscosity coefficients of two nematic liquid crystals

1992 ◽  
Vol 77 (3) ◽  
pp. 521-538 ◽  
Author(s):  
H.-H. Graf ◽  
H. Kneppe ◽  
F. Schneider
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Viscosity Coefficients ◽  
Rotational Viscosity
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