Results 11 to 20 of about 2,929 (285)

Intrinsic optical bistability via switching between saturable and reverse saturable absorption [PDF]

Scientific Reports
We present a novel approach to achieving intrinsic optical bistability and multistability through the interplay between saturable and reverse saturable absorption. Our findings reveal that the stable points on the optical bistability curve align with the
Seyed Morteza Mousavi, Mohammad Mahmoudi
doaj   +4 more sources

Controlling Stimulated Emission via Intramolecular Charge Transfer in Amino-Coumarin Dyes: Switching from Reverse Saturable to Saturable Absorption [PDF]

Molecules
Given the pivotal role of coumarins as tunable nonlinear optical (NLO) materials for advanced photonics, this study aims to decipher the regulatory mechanisms governing their excited-state dynamics and nonlinear absorption.
Jidong Jia, Siya Wu, Yinlin Lu, Jingyuan Xu, Hang Zuo, Xingzhi Wu, Yinglin Song   +6 more
doaj   +3 more sources

Enhancement of Broadband Reverse Saturable Absorption of Red/Black Phosphorus Heterojunction [PDF]

Molecules
Although laser technology brings convenience to production and daily life, it also causes high-energy damage. Therefore, there is an urgent need to develop optical limiting materials for laser protection. In this study, a novel nonlinear optical material,
Jingjing Wang, Fulai Liu, Yunfei Li, Long Chen, Yong Chen, Hailong Zhang, Zheng Xie   +6 more
doaj   +3 more sources

Reverse Saturable Absorption in the Near-Infrared by Fused Porphyrin Dimers

Advanced Materials, 2004
Bromine and iodine substituents increase the yield of triplet excited states in a triply linked fused porphyrin dimer (see Figure), resulting in efficient reverse saturable absorption in the near-infrared range at 600-970 nm on the nanosecond timescale.
P A Fleitz, Jonathan Slagle, Harry L Anderson   +2 more
exaly   +5 more sources

Paradoxical combination of saturable absorption and reverse-saturable absorption in plasmon semiconductor nanocrystals. [PDF]

Nanoscale Adv, 2020
The competition between plasma ground-state bleaching and three-photon absorption is demonstrated to be responsible for the transition between saturable absorption and reverse saturable absorption in aluminum-doped ZnO nanocrystals.
Tian X, Wei R, Yang D, Qiu J.
europepmc   +4 more sources

Enhanced Ultrafast Broadband Reverse Saturable Absorption in Twistacenes with Enlarged π-Conjugated Central Bridge [PDF]

Molecules, 2022
Optical nonlinearities of two all-carbon twistacenes, DPyA and DPyN, with the different π-conjugated central bridges were investigated. The nonlinear absorption properties of these compounds were measured using the femtosecond Z-scan with wavelengths ...
Xindi Liu, Wenfa Zhou, Mengyi Wang, Xingzhi Wu, Jidong Jia, Jinchong Xiao, Junyi Yang, Yinglin Song   +7 more
doaj   +2 more sources

Reverse saturable absorption in solid xerogel matrices [PDF]

Applied Physics Letters, 1993
Aluminophthalocyanine (APC) and fullerene carbon 60 (C60) have been studied encaged in different silica matrices. The reverse saturable absorption properties of these doped xerogels have been compared to those of reference solutions of APC and C60. We show that reverse saturable absorber molecules retain their properties even when they are enclosed in ...
Bentivegna, Florian, Canva, Michael, Georges, Patrick, Brun, Alain, Chaput, Frédéric, Malier, Laurent, Boilot, Jean-Pierre   +6 more
openaire   +3 more sources

Observation of Reverse Saturable Absorption of an X-ray Laser [PDF]

Physical Review Letters, 2017
A nonlinear absorber in which the excited state absorption is larger than the ground state can undergo a process called reverse saturable absorption. It is a well-known phenomenon in laser physics in the optical regime, but is more difficult to generate in the x-ray regime, where fast nonradiative core electron transitions typically dominate the ...
Cho, B. I., Cho, M. S., Hájková, V., Holmes, M., Juha, L., Krzywinski, J., Lee, R. W., Nam, Chang Hee, Rackstraw, D. S., Toleikis, S., Turner, J. J., Vinko, S. M., Kim, M., Wark, J. S., Zastrau, U., Heimann, P. A., Chung, H.-K., Barbrel, B., Engelhorn, K., Burian, T., Chalupský, J., Ciricosta, O., Dakovski, G. L.   +22 more
openaire   +6 more sources

Pulse-duration dependence of saturable and reverse saturable absorption in ZnCo2O4 microflowers [PDF]

Optical Materials, 2021
We employed open-aperture Z-scan technique to unveil the third-order optical nonlinearity in ZnCo2O4 (ZCO) microflowers. Our results indicate that intersystem crossing (ISC) lifetime can be used as simple tool to demonstrate remarkably contrasting optical nonlinearity in ZCO.
Pritam Khan, Rajesh Kumar Yadav, Anirban Mondal, Chandra Sekhar Rout, K.V. Adarsh   +4 more
openaire   +3 more sources

Self-Saturable Absorption and Reverse-Saturable Absorption Effects in Diamond-Like Carbon Films with Embedded Copper Nanoparticles [PDF]

Coatings, 2019
Nonlinear optical properties (self-saturable absorption and reverse-saturable absorption) of diamond-like carbon films with variable amounts of embedded copper nanoparticle (DLC:Cu) films deposited by high power pulse magnetron sputtering were studied in dependence on deposition conditions.
Meškinis, Šarūnas, Vasiliauskas, Andrius, Andrulevičius, Mindaugas, Jurkevičiūtė, Aušrinė, Peckus, Domantas, Kopustinskas, Vitoldas, Viskontas, Karolis, Tamulevičius, Sigitas   +7 more
openaire   +3 more sources