Open AccessAbsorptive and refractive nonlinearities by four-wave mixing for Au nanoparticles in ion-implanted silica
Author(s) -
C. Torres-Torres,
А. В. Хоменко,
J.C. Cheang-Wong,
L. Rodrı́guez-Fernández,
A. Crespo-Sosa,
A. Oliver
Publication year - 2007
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.15.009248
Subject(s) - materials science , refractive index , four wave mixing , optics , nanosecond , absorption (acoustics) , ion , mixing (physics) , nonlinear optics , diffraction , attenuation coefficient , dispersion (optics) , nanoparticle , optoelectronics , chemistry , physics , laser , nanotechnology , organic chemistry , quantum mechanics
We report a theoretical and experimental study on the real and imaginary part of the third-order nonlinear optical susceptibility at 532 nm and 7 ns pulse for high-purity silica samples containing Au nanoparticles prepared by ion implantation. We present a method for measuring the magnitude and sign of refractive and absorptive nonlinearities based on four-wave mixing (FWM). This method is derived from a comparison of the light intensities of incident and self-diffracted polarized waves. In the nanosecond regime the samples exhibit saturable absorption and it seems that a thermal effect is the mechanism responsible of nonlinearity of index.