Nonlinear Fiber Core Liquid and Nematic Liquid Crystal Film for Wide Temporal Bandwidth Optical Limiting Application

1999 ◽  
Vol 597 ◽  
Author(s):  
I. C. Khoo
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Optical Fiber ◽  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Optical Limiting ◽  
Optical Nonlinearity ◽  
Fiber Core ◽  
Crystal Film ◽  
Nonlinear Fiber

AbstractNonlinear absorption processes in an extremely nonlinear optical fiber core liquid, and recently observed supra-optical-nonlinearity in dopant modified nematic liquid crystals, are discussed in the context of optical limiting and anti-laser dazzling application.

scholarly journals Нелинейное поглощение растворов метиленового голубого в присутствии плазмонных наночастиц с различным поверхностным зарядом

2020 ◽  
Vol 128 (9) ◽  
pp. 1380
Author(s):  
А.П. Русинов ◽  
М.Г. Кучеренко
Keyword(s):  
Methylene Blue ◽  
Silver Nanoparticles ◽  
Mathematical Models ◽  
Surface Charge ◽  
Light Absorption ◽  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Optical Nonlinearity ◽  
Dye Molecules ◽  
Gold And Silver Nanoparticles

By continuous-pump Z-scanning, the nonlinear light absorption of aqueous and alcohol solutions of methylene blue was studied. It was shown that the mechanisms of optical nonlinearity of these solutions vary depending on the dye concentration and type of solvent. The dependence of the amplitude of nonlinear absorption of dye molecules on the concentration and sign of the surface charge of gold and silver nanoparticles in solution is revealed. Mathematical models of optical nonlinearity for concentrated and diluted solutions of dye molecules are considered; in the latter case, the influence of plasmon nanoparticles on the nonlinear optical characteristics of methylene blue solutions is taken into account

scholarly journals Nolinear optical liquid cored fiber array and liquid crystal film fo ps-cw frequency agile laser optical limiting application

1998 ◽  
Vol 2 (12) ◽  
pp. 471 ◽  
Author(s):  
Iam-Choon Khoo ◽  
Michael Wood ◽  
Brett Dean Guenther ◽  
Min-Yi Shih ◽  
Pao Chen ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Optical Limiting ◽  
Fiber Array ◽  
Crystal Film ◽  
Frequency Agile

Nonlinear optical properties of polyphthalocyanine porous organic frameworks

2020 ◽  
Vol 44 (36) ◽  
pp. 15345-15349
Author(s):  
Tingfeng Wang ◽  
Tao Sun ◽  
Wei Tang ◽  
Wenbo Huang ◽  
Wenxiang Zhang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Optical Limiting ◽  
Nonlinear Optical Properties

sp3-hybridized carbon bridge polyphthalocyanine porous organic frameworks can enhance nonlinear absorption and optical limiting properties.

NONLINEAR-OPTICAL AND OPTICAL LIMITING PROPERTIES OF PHENOXY-PHTHALOCYANINES STUDIED USING THE Z-SCAN TECHNIQUE

2009 ◽  
Vol 18 (04) ◽  
pp. 583-589 ◽  
Author(s):  
YUNDONG ZHANG ◽  
LEI MA ◽  
CHAOBO YANG ◽  
PING YUAN
Keyword(s):  
Absorption Coefficient ◽  
Low Power ◽  
Pulse Laser ◽  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Optical Limiting ◽  
Nonlinear Absorption Coefficient ◽  
Potential Candidate ◽  
Single Beam ◽  
532 Nm

The nonlinear-optical and optical limiting properties of 2(3), 9(10), 16(17), 23(24) phenoxy-phthalocyanines have been investigated using a 10-ns-pulse laser at 532 nm. The nonlinear absorption coefficient (β) is measured by the single beam Z-scan technique. We have observed low power optical limiting, with low limiting thresholds, based on nonlinear absorption in the sample. These studies indicate that the phthalocyanine material is a potential candidate for low power optical limiting applications.

Modeling nonlinear photonics of nonlinear fiber core for optical limiting application

2000 ◽  
Author(s):  
Iam-Choon Khoo ◽  
Michael V. Wood ◽  
Pao H. Chen ◽  
Min-Yi Shih ◽  
Atsushi Shishido ◽  
...  
Keyword(s):  
Optical Limiting ◽  
Fiber Core ◽  
Nonlinear Fiber ◽  
Nonlinear Photonics

scholarly journals Nonlinear optical properties of metal-alkanoate liquid crystalline media

2018 ◽  
pp. 89-94
Author(s):  
O. Gridyakina ◽  
H. Bordyuh ◽  
O. Bilous
Keyword(s):  
Ionic Liquid ◽  
Optical Properties ◽  
Liquid Crystals ◽  
Nonlinear Optical ◽  
Nonlinear Response ◽  
Optical Nonlinearity ◽  
Nonlinear Optical Properties ◽  
Nonlinear Susceptibility ◽  
Nanosecond Laser ◽  
Ionic Liquid Crystals

This work presents the analysis of experimental data on studies of optical and nonlinear optical properties of lyotropic ionic liquid crystals of potassium caprylate doped with electrochromic viologen admixtures, and smectic glasses of thermotropic ionic liquid crystals of cobalt alkanoates homologous series (number of carbon atoms in alkanoate chain n = 7, 9, 11) and their multicomponent mixtures. Prior to performing nonlinear optical experiment the optical absorption spectra for all samples were investigated. Laser induced dynamic grating recording under the action of nanosecond laser pulses was realized, observed and analyzed for the proposed absorptive media. It was discovered that studied materials are characterized by cubic optical nonlinearity and have values of cubic nonlinear susceptibility χ(3) and hyperpolarizability γ comparable with the best characteristics of organic dyes. The possible mechanism of nonlinear response in studied systems was considered on the base of obtained data. The nonlinear response mechanism is connected with nonlinear polarization of π-electrons in the field of laser radiation.

scholarly journals Optical fiber sensor based on a cholesteric liquid crystal film for mixed VOC sensing

2020 ◽  
Vol 28 (21) ◽  
pp. 31872 ◽  
Author(s):  
Yunhe Yang ◽  
Dong Zhou ◽  
Xiujuan Liu ◽  
Yongjun Liu ◽  
Shuangqiang Liu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Optical Fiber ◽  
Cholesteric Liquid Crystal ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Crystal Film

scholarly journals Hybrid photosensitive structures based on nematic liquid crystals and lithium niobate substrates

2018 ◽  
Vol 4 (1) ◽  
pp. 14-21 ◽  
Author(s):  
Liana Lucchetti ◽  
Victor Reshetnyak
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Lithium Niobate ◽  
Nonlinear Optical ◽  
Photovoltaic Effect ◽  
Hybrid Structures ◽  
Liquid Crystal Films ◽  
Self Assembling ◽  
Crystal Films ◽  
Crystal Cells

Abstract Liquid crystal cells based on lithium niobate substrates have recently been proposed as good candidates for optofluidic devices and for light-induced controlled generation of defects in liquid crystal films. The peculiarity of these structures lies in the possibility of using the bulk photovoltaic effect of lithium niobate to obtain an optically induced dc field able to affect the molecular liquid crystal director. Reversible fragmentation and self-assembling of liquid crystal droplets driven by the lithium niobate pyroelectric properties have also been reported. We review the basic results obtained so far with the aim of making the point and seeing what else can be done in the framework of the realization of hybrid structures combining lithium niobate with the electro-optical and nonlinear optical properties of liquid crystals.

scholarly journals Laser induced protonation of free base porphyrin in chloroform results in the enhancement of positive nonlinear absorption due to conformational distortion

2013 ◽  
Vol 17 (11) ◽  
pp. 1129-1133 ◽  
Author(s):  
Monika Zawadzka ◽  
Jun Wang ◽  
Werner J. Blau ◽  
Mathias O. Senge
Keyword(s):  
Laser Beam ◽  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Chloroform Solution ◽  
Optical Limiting ◽  
Free Base ◽  
Nlo Materials ◽  
Set Up

Free base porphyrin in chloroform solution irradiated with focused laser beam, in an open Z-scan set-up, changed color from purple to green, which was associated with protonation of the porphyrin with protonic species from photodegradation of the solvent. Protonation is demonstrated as a simple means to improve the optical limiting performance of free base porphyrin nonlinear optical (NLO) materials.

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