Open AccessOne photon nonresonant high-order nonlinear optical properties of silver nanoparticles in aqueous solution
Author(s) -
Diego Rátiva,
Renato E. de Araujo,
Anderson S. L. Gomes
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.019244
Subject(s) - materials science , nanoparticle , colloid , aqueous solution , optics , nonlinear optics , laser , silver nanoparticle , excitation , photon , nonlinear system , molecular physics , nanotechnology , physics , chemistry , quantum mechanics
In this work we determine the third, fifth- and seventh-order nonresonant nonlinear optical properties of silver nanoparticles (9 nm average diameter) colloids in aqueous solution under high intensity excitation. The nonlinear optical response and its dependence with the nanoparticles filling factor was measured and theoretically described. We show that for low inclusion concentration, the third order nonlinearity of the colloid can be described by the generalized Maxwell-Garnett model. With the increase of the nanoparticle concentration, changes in the medium nonlinearities was observed leading to high order effects. The fifth- and seventh- order susceptibilities were obtained for highly concentrated silver nanoparticle colloid and the data was supported by a theoretical model. The conventional Z-scan technique was employed, using 80 f s laser pulses at 800 nm, in a regime of high pulse energy (microJ) and low repetition rate (1 kHz).