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

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

Effect of gold nanoparticles on intrinsic material parameters and luminescent characteristics of nematic liquid crystals

2019 ◽  
Vol 295 ◽  
pp. 111872 ◽  
Author(s):  
Aradhana Roy ◽  
Bhupendra Pratap Singh ◽  
Geeta Yadav ◽  
Hiba Khan ◽  
Sandeep Kumar ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Material Parameters

scholarly journals Enhanced Photoluminescence in Gold Nanoparticles Doped Homogeneous Planar Nematic Liquid Crystals

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Chi-Huang Chang ◽  
Rong-Ji Lin ◽  
Chuen-Lin Tien ◽  
Shang-Min Yeh
Keyword(s):  
Gold Nanoparticles ◽  
Liquid Crystals ◽  
Surface Area ◽  
Nematic Liquid Crystals ◽  
Subsequent Decay ◽  
Enhanced Photoluminescence ◽  
Pl Intensity

This study reported the photoluminescence (PL) of gold nanoparticles (GNPs) doped planar nematic liquid crystals (NLCs) and observed around 64% enhancement in PL intensity with suitable doping amounts of GNPs in liquid crystals 5CB. The enhancement in PL intensity has been attributed to the increased surface area from GNPs, which results in increased emissions due to the increased scattering of excitation. The subsequent decay of PL intensity with doping more amounts of GNPs in liquid crystals 5CB was due to the aggregation of the GNPs, which resulted in decayed emissions due to the decay of the scattering of excitation. The concentration and the size of GNPs, as well as the orientation of the LCs’ director, with respect to the excitation, which depend on the intensity of the PL, were also investigated.

Photo-thermal effects in gold nanoparticles dispersed in thermotropic nematic liquid crystals

2015 ◽  
Vol 17 (31) ◽  
pp. 20281-20287 ◽  
Author(s):  
Luigia Pezzi ◽  
Luciano De Sio ◽  
Alessandro Veltri ◽  
Tiziana Placido ◽  
Giovanna Palermo ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Gold Nanoparticles ◽  
Liquid Crystals ◽  
Thermal Effects ◽  
Nematic Liquid Crystals ◽  
Anisotropic Media ◽  
Nanoscale Heat Transfer

Investigation of nanoscale heat transfer in anisotropic media by combining the plasmonic properties of gold nanoparticles and the thermosensitivity of liquid crystals.

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.

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