title: Absorptive and refractive nonlinearities by four-wave mixing for Au nanoparticles in ion-implanted silica.
abstract: 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.
authors: C
authors: C
authors: Torres-Torres
authors: A V
authors: AV
authors: Khomenko
authors: J C
authors: JC
authors: Cheang-Wong
authors: L
authors: L
authors: Rodríguez-Fernández
authors: A
authors: A
authors: Crespo-Sosa
authors: A
authors: A
authors: Oliver