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Opt Lett. 2010 May 15;35(10):1560-2. doi: 10.1364/OL.35.001560.

Intensity-dependent reversal of nonlinearity sign in a gold nanoparticle array.

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  • 1Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.


The optical nonlinearities of a Au nanoparticle array were determined by performing Z-scan measurements with a femtosecond laser (800 nm, 50 fs). 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.

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