Orientational optical nonlinearity of nematic liquid crystals for image conversion and optical limiting

1999 ◽  
Author(s):  
Iam-Choon Khoo ◽  
Min-Yi Shih ◽  
Michael V. Wood ◽  
Pao H. Chen
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Optical Limiting ◽  
Optical Nonlinearity ◽  
Image Conversion

Orientational optical nonlinearity of nematic liquid crystals induced by high-molecular-mass azo-containing compounds

2011 ◽  
Vol 53 (8) ◽  
pp. 655-665 ◽  
Author(s):  
I. A. Budagovsky ◽  
A. S. Zolot’ko ◽  
V. N. Ochkin ◽  
M. P. Smayev ◽  
S. A. Shvetsov ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Molecular Mass ◽  
Nematic Liquid Crystals ◽  
Optical Nonlinearity ◽  
High Molecular Mass

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.

scholarly journals Dynamic Grating Recording by a Light-Induced Modification of the Order Parameter in Dye-Doped Chiral Nematic Liquid Crystals

2019 ◽  
Vol 64 (4) ◽  
pp. 293 ◽  
Author(s):  
A. Iljin ◽  
D. Wei ◽  
U. Bortolozzo ◽  
S. Residori
Keyword(s):  
Liquid Crystals ◽  
Order Parameter ◽  
Response Times ◽  
Nematic Liquid Crystals ◽  
Helical Structure ◽  
Fast Response ◽  
Optical Nonlinearity ◽  
Chiral Structure ◽  
Chiral Nematic ◽  
Dynamic Grating

The dynamic grating recording in dye-doped chiral nematic liquid crystals is studied. It is shown that the mechanism responsible for the grating recording can be ascribed to a photoinduced modification of the order parameter of a liquid crystal within the range of optical intensities, for which the orientational nonlinearity remains quenched by the structural order of the chiral structure. The two-wave mixing dynamic behavior is analyzed for different intensities of the recording beams, by comparing the self-diffraction regime with the probe diffraction. This allows us to distinguish a particular mechanism of optical nonlinearity. The photo-induced modulation of the order parameter and the respective changes of medium’s refractive indices determine the relatively fast response times, local nonlinear response, and quite high diffraction efficiency within an extremely wide intensity range (more than three orders of magnitude) The chiral helical structure hinders the nematic director reorientation, prevents the appearance of surface effects, and is very favorable for the manipulation of a nonlinear polarization. Such new mechanism could also be extended to the recording of arbitrary phase profiles as requested in several applications for the manipulation of a light-beam.

High Optical Nonlinearity of Nematic Liquid Crystals Doped with Gold Nanoparticles

2012 ◽  
Vol 116 (23) ◽  
pp. 12934-12939 ◽  
Author(s):  
Nina Podoliak ◽  
Dorota Bartczak ◽  
Oleksandr Buchnev ◽  
Antonios G. Kanaras ◽  
Malgosia Kaczmarek
Keyword(s):  
Gold Nanoparticles ◽  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Optical Nonlinearity

Orientational optical nonlinearity of nematic liquid crystals integrated with THz metamaterials

2021 ◽  
Author(s):  
Eleni Perivolari ◽  
Vassili A. Fedotov ◽  
Vasilis Apostolopoulos ◽  
Malgosia Kaczmarek
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Optical Nonlinearity

CONFORMATIONAL OPTICAL NONLINEARITY OF NEMATIC LIQUID CRYSTALS

1992 ◽  
Vol 01 (03) ◽  
pp. 447-472 ◽  
Author(s):  
I.P. PINKEVICH ◽  
YU. A. REZNIKOV ◽  
V. YU. RESHETNYAK ◽  
O.V. YAROSHCHUK
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Optical Nonlinearity

Thermal optical nonlinearity in photonic crystal fibers filled with nematic liquid crystals doped with gold nanoparticles

2017 ◽  
Author(s):  
Piotr Lesiak ◽  
Daniel Budaszewski ◽  
Karolina Bednarska ◽  
Michał Wójcik ◽  
Piotr Sobotka ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Liquid Crystals ◽  
Photonic Crystal ◽  
Photonic Crystal Fibers ◽  
Nematic Liquid Crystals ◽  
Optical Nonlinearity ◽  
Crystal Fibers
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