Abstract

The optical nonlinearities of a Au nanoparticle array were determined by performing Z-scan measurements with a femtosecond laser (800nm, 50fs). As the exciting energy increased, the nonlinear absorption of the Au nanoparticle array changed from reverse-saturable absorption to saturable absorption, while the nonlinear refraction changed from self-defocusing to self-focusing, which implies competition between ground-state bleaching and two-photon absorption. One- and two-photon figures of merit of W=5.1 and T=0.11, respectively, were obtained that satisfy the demand, W>1 and T<1, for all-optical switching.

© 2010 Optical Society of America

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