Results 251 to 260 of about 2,929 (285)

Saturable and reverse saturable absorption of a Cu2O–Ag nanoheterostructure

Journal of Materials Science, 2018
Cu2O–Ag nanoheterostructure was synthesized by a simple and eco-friendly co-precipitation method, and its morphologic structure, linear and nonlinear optical properties were studied. Though pure Cu2O nano- and microparticles are known for their nonlinear absorption properties, current studies show that Ag nanoparticle in contact with Cu2O can ...
Nabil A. Saad, Mudasir H. Dar, E. Ramya, Sri Ram G. Naraharisetty, D. Narayana Rao   +4 more
openaire   +1 more source

Dynamics of Reverse Saturable Absorption in Phthalocyanines

Nonlinear Optics: Materials, Fundamentals, and Applications, 1992
Saturable absorption (SA) in organometallic compounds, such as phthalocyanine (Pc), was extensively studied in 1960’s, the purpose of the research was to find suitable dyes to compress laser pulse. As we know, SA is due to the absorption of the ground state, which can be described by a two-level model or a three-level model[1].
Chunfei Li, Hui Wang
openaire   +1 more source

Saturable and reverse saturable absorption of Rhodamine B in methanol and water

Journal of the Optical Society of America B, 2003
We have investigated nonlinear absorption of Rhodamine B dye in methanol and water near resonance (532 nm) on the higher-energy (435 nm) and lower-energy (600 nm) sides of the absorption band, using an open-aperture Z-scan technique with nanosecond pulses.
Srinivas, N.K.M.N., Rao, S.V., Rao, D.N.
openaire   +1 more source

Reverse saturable absorption in chlorophyll A solutions

Applied Physics B, 2002
The dynamic nonlinear absorption of a chloroform solution of chlorophyll A was investigated using the Z-scan technique with picosecond pulses at 532 nm. The nonlinear absorption exhibits a reverse saturation, indicating a strong intersystem crossing (singlet–triplet) process.
D.S. Corrêa, L. De Boni, D.S. dos Santos, N.M. Barbosa Neto, O.N. Oliveira, L. Misoguti, S.C. Zilio, C.R. Mendonça   +7 more
openaire   +1 more source

Broadband saturable and reverse saturable absorption in graphene-based nanocomposites

CLEO: 2013, 2013
Nonlinear optical studies are carried out on graphene-based polymer composites in the nanosecond and picosecond temporal regime. These graphene-composites demonstrate saturable absorption followed by reverse saturable absorption which depends on graphene content and operation regime.
Saima Husaini, Jonathan E. Slagle, Joel M. Murray, Shekhar Guha, Leonel P. Gonzalez, Robert G. Bedford   +5 more
openaire   +1 more source

Saturation and reverse saturation of nonlinear absorption in laser ablated gold nanoparticles

Materials Today: Proceedings, 2023
Abstract The optoelectronic application of gold nanoparticles is majorly influenced by certain unique features they exhibit, like surface plasmon resonance, ready functionalization and ease of conjugation with bio-analytes etc. Production of gold nanoparticles through laser ablation is the simplest method with the advantage of obtaining high purity ...
Mani Priyadarshini, G. Vijaya Prakash
openaire   +1 more source

Saturable absorption and the changeover from saturable absorption to reverse saturable absorption of MoS₂ nanoflake array films

J. Mater. Chem. C, 2014
MoS2 nanoflake array films on different glass substrates were fabricated by an in situ growth method. The nonlinear absorption (NLA) properties of the MoS2 nanoflake array films were investigated by an open-aperture Z-scan technique. The films exhibited different NLA properties dependent on the input energy.
Qiuyun Ouyang, Hailong Yu, Kai Zhang, Yujin Chen   +3 more
openaire   +1 more source

Reverse saturable Absorption in Organically Doped Xerogels

MRS Proceedings, 1997
AbstractPd and Zn - tetraphenyltetrabenzoporphyrins (PdTPTBP and ZnTPTBP), hexacyanin 3 (HITCI), and substituted phthalocyanines were incorporated in solid-state matrices (xerogels) using a sol-gel process. Nonlinear reverse saturable absorption was observed with those materials when they were illuminated with nanosecond laser pulses at 532 nm, or ...
M. Brunel, F. Chaput, S. A. Vinogradov, B. Campagne, M. Canva, J-P. Boilot, A. Brun   +6 more
openaire   +1 more source

Investigation of Reverse-Saturable Absorption in Brominated Porphyrins

Chemistry of Materials, 1998
To develop more efficient materials to be used in optical limiters, we have synthesized a series of metal-containing brominated tetraphenylporphyrin (MOBP) reverse-saturable absorber (RSA) dyes. ZnOBP was the highest efficiency RSA chromophore. Moreover, ZnOBP had nonlinear absorption that compared well to state-of-the-art phthalocyanine RSA dyes.
Weijie Su, Thomas M. Cooper, Mark C. Brant   +2 more
openaire   +1 more source

Materials for Reverse Saturable Absorption Optical Limiters

MRS Proceedings, 1994
AbstractSystematic studies of the nonlinear optical properties of metallo-organic materials have led to the development of promising new phthalocyanine materials for optical limiting. Several heavy metal substituted phthalocyanines exhibit a strong nonlinear absorption that is useful for optical limiters in the visible.
James S. Shirk, Richard G. S. Pong, Steven R. Flom, Michael E. Boyle, Arthur W. Snow   +4 more
openaire   +1 more source