Optical Limiting in Modified meso-alkynyl Porphyrins

1997 ◽  
Vol 479 ◽  
Author(s):  
Nansheng Tang ◽  
Weijie Su ◽  
Douglas M. Krein ◽  
Daniel G. McLean ◽  
Mark C. Brant ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cross Sections ◽  
Absorption Maximum ◽  
Optical Limiting ◽  
Absorption Cross

AbstractWe characterize the optical properties of modified meso-alkynyl porphyrins by a number of techniques. Our data show that extending the conjugation and incorporating metal in the center of the ring in these molecules serve the objective of tuning the absorption maximum wavelength. We evaluate the optical limiting performance by determining the effective reversesaturable- absorption (RSA) lifetime and the change in the absorption cross-sections. The ultimate optical limiting performance of these molecules is tested in both picosecond and nanosecond regimes.

scholarly journals Improved One- and Multiple-Photon Excited Photoluminescence from Cd2+-Doped CsPbBr3 Perovskite NCs

Nanomaterials ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 151
Author(s):  
Ivan D. Skurlov ◽  
Wenxu Yin ◽  
Azat O. Ismagilov ◽  
Anton N. Tcypkin ◽  
Haohang Hua ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cross Sections ◽  
Nonlinear Optical ◽  
Metal Halide ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Trap States ◽  
Metal Halide Perovskite ◽  
Halide Perovskite ◽  
Optical Applications

Metal halide perovskite nanocrystals (NCs) attract much attention for light-emitting applications due to their exceptional optical properties. More recently, perovskite NCs have begun to be considered a promising material for nonlinear optical applications. Numerous strategies have recently been developed to improve the properties of metal halide perovskite NCs. Among them, B-site doping is one of the most promising ways to enhance their brightness and stability. However, there is a lack of study of the influence of B-site doping on the nonlinear optical properties of inorganic perovskite NCs. Here, we demonstrate that Cd2+ doping simultaneously improves both the linear (higher photoluminescence quantum yield, larger exciton binding energy, reduced trap states density, and faster radiative recombination) and nonlinear (higher two- and three-photon absorption cross-sections) optical properties of CsPbBr3 NCs. Cd2+ doping results in a two-photon absorption cross-section, reaching 2.6 × 106 Goeppert-Mayer (GM), which is among the highest reported for CsPbBr3 NCs.

Perylene Derivatives with Large Two-Photon-Absorption Cross-Sections for Application in Optical Limiting and Upconversion Lasing

2005 ◽  
Vol 17 (15) ◽  
pp. 1890-1893 ◽  
Author(s):  
S. L. Oliveira ◽  
D. S. Corrêa ◽  
L. Misoguti ◽  
C. J. L. Constantino ◽  
R. F. Aroca ◽  
...  
Keyword(s):  
Cross Sections ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Perylene Derivatives

The Design and Synthesis of New Organic Molecules with Large Two-Photon Absorption Cross-Sections for Optical Limiting Applications

1997 ◽  
Vol 479 ◽  
Author(s):  
B. A. Reinhardt ◽  
L. L. Brott ◽  
S. J. Clarson ◽  
R. Kannan ◽  
A. G. Dillard
Keyword(s):  
Cross Sections ◽  
Nonlinear Optical ◽  
Organic Molecules ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Two Photon Absorption ◽  
Design And Synthesis ◽  
Two Photon ◽  
Nlo Property

AbstractThe molecular structure / nonlinear optical (NLO) property relationship is explored with seven recently synthesized chromophores. Two symmetrical compounds were made using electron withdrawing groups separated by an electron rich core while five asymmetrical molecules were developed using electron donating and withdrawing groups coupled by a it electron bridging group. Pendant chains were added to some of the chromophores to improve processibility. Their syntheses are described and their optical limiting properties discussed.

scholarly journals Optical properties of laboratory grown sea ice doped with light absorbing impurities (black carbon)

2017 ◽  
Author(s):  
Amelia A. Marks ◽  
Maxim L. Lamare ◽  
Martin D. King
Keyword(s):  
Optical Properties ◽  
Radiative Transfer ◽  
Sea Ice ◽  
Black Carbon ◽  
Penetration Depth ◽  
Cross Sections ◽  
Absorption Cross ◽  
Light Penetration ◽  
Irradiance Data ◽  
Snow Model

Abstract. Sea ice radiative-transfer models are of great importance for prediction of future sea ice trends but they are limited by uncertainty in models and requirement for evaluation of modelled irradiance data against measured irradiance data. Presented here are the first results from the Royal Holloway sea ice simulator used to evaluate the output of the TUV-snow radiative-transfer model against the optical properties from the simulated sea ice. The sea ice simulator creates a realistic sea ice environment where both optical (reflectance and light penetration depth (e-folding depth)) and physical (temperature, salinity, density) properties of a ∼ 30 cm thick sea ice can be monitored and measured. Using albedo and e-folding depth data measured from simulated sea ice, scattering and absorption cross-sections of the ice are derived using the TUV-snow model. Absorption cross-sections for the ice are highly wavelength dependent, suggesting the addition of a further absorbing impurity in the ice matching the absorption spectrum of algae. Scattering cross-sections were wavelength independent with values ranging from 0.012 and 0.032 cm2 kg−1 for different ice created in the simulator. Reflectance and light penetration depth (e-folding depth) of sea ice is calculated from the derived values of the scattering and absorption cross-section using the TUV-snow model within error of the experiment. The model is also shown to replicate ice optical properties for sea ice with an extra layer doped with black carbon, well within error of the experiment. Particulate black carbon at mass ratios of 75, 150 and 300 ng g−1 in a 5 cm ice layer lowers the albedo by 97 %, 90 %, and 79 % compared to clean ice at a wavelength of 500 nm.

Plasmonic rod-in-shell nanoparticles for photothermal therapy

2014 ◽  
Vol 16 (24) ◽  
pp. 12275-12281 ◽  
Author(s):  
Shanshan Wang ◽  
Hong Xu ◽  
Jian Ye
Keyword(s):  
Optical Properties ◽  
Cross Section ◽  
Heat Generation ◽  
Cross Sections ◽  
Absorption Cross Section ◽  
Photothermal Therapy ◽  
Absorption Cross ◽  
Shell Nanoparticles ◽  
Tunable Absorption

The plasmonic rod-in-shell nanoparticles have a number of favorable optical properties for the photothermal therapy application compared to the nanorods: increased longitudinal and transversal absorption cross-sections in the NIR window I, a larger and highly tunable absorption cross-section in the NIR window II, orientation of particles insensitive to the heat generation.

scholarly journals Cooperative enhancement versus additivity of two-photon-absorption cross sections in linear and branched squaraine superchromophores

2016 ◽  
Vol 18 (24) ◽  
pp. 16404-16413 ◽  
Author(s):  
Harald Ceymann ◽  
Arnulf Rosspeintner ◽  
Maximilian H. Schreck ◽  
Carina Mützel ◽  
Andreas Stoy ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cross Sections ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Two Photon Absorption ◽  
Squaraine Dyes ◽  
Two Photon

Our investigation of the nonlinear optical properties of a series of oligomeric squaraine dyes showed enhanced cross sections for linear oligomers but only additivity for branched systems.

Optical limiting properties and ultrafast response of three oligomers based on 1,3,5-triazine

2018 ◽  
Vol 27 (03) ◽  
pp. 1850026 ◽  
Author(s):  
Yaochuan Wang ◽  
Yizhuo Wang ◽  
Guiqiu Wang ◽  
Dajun Liu
Keyword(s):  
Cross Sections ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Absorption Mechanism ◽  
Pump Probe ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Transfer State ◽  
Probe Measurements

Three tri-branched oligomers based on 1,3,5-triazine with large two-photon absorption cross-sections and good optical limiting properties were investigated by UV–Visible, femtosecond Z-scan and one/two-color pump-probe measurements. The two-photon absorption cross-section results measured at a wavelength of 800[Formula: see text]nm were found decreasing with the number of fluorene groups in each branches. The optical limiting properties were also investigated and a two-photon absorption mechanism was proposed. One/two-color pump-probe measurements were also used to further investigate the ultrafast responses of these tri-branched oligomers. The ultrafast response results indicated that after excitation, the tri-branched oligomers will first undergo a fast process to form an intramolecular charge transfer state followed by relaxation of the intramolecular charger transfer state of approximately several hundred ps.

Fluorenylethynylpyrene derivatives with strong two-photon absorption: influence of substituents on optical properties

2015 ◽  
Vol 3 (15) ◽  
pp. 3730-3744 ◽  
Author(s):  
C. Lavanya Devi ◽  
K. Yesudas ◽  
Nikolay S. Makarov ◽  
V. Jayathirtha Rao ◽  
K. Bhanuprakash ◽  
...  
Keyword(s):  
Optical Properties ◽  
Cross Sections ◽  
Photon Absorption ◽  
Quantum Yields ◽  
Absorption Cross ◽  
Two Photon Absorption ◽  
Fluorescence Quantum Yields ◽  
Two Photon ◽  
Influence Of Substituents

A series of fluorenylethynylpyrene derivatives with large two-photon absorption cross-sections (≈250–2500 GM) and good fluorescence quantum yields (Φfl = 0.55–0.98) and with high two-photon brightness were synthesized.

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