Optical nonlinearities of Au nanoparticles embedded in a zinc oxide matrix |
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Authors: | A.I. Ryasnyanskiy B. Palpant U. Pal |
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Affiliation: | a Institut des Nano-Sciences de Paris, Université Pierre et Marie Curie - Paris 6, Université Denis Diderot - Paris 7, CNRS, UMR 7588, 140 rue de Lourmel, 75015 Paris, France b Instituto de Física, Universidad Autónoma de Puebla, Apdo. Postal J-48, Puebla, Pue. 72570, Mexico c Kazan Physics-Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russian Federation |
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Abstract: | Optical nonlinearities of Au nanoparticles embedded in zinc oxide (ZnO) matrix have been investigated by the Z-scan method at the wavelength of 532 nm using nanosecond Nd3+:YAG laser radiation. The nonlinear refractive index has been measured and the real part of the third-order nonlinear susceptibility is deduced. The results of the investigation of nonlinear refraction using the off-axis Z-scan configuration are presented and the mechanisms responsible for the nonlinear response are discussed. The nonlinear refraction is found to be negative (self-defocusing) in the vicinity of the surface plasmon resonance. Moreover, its strength is shown to be larger for materials having higher gold concentration. Finally, the prevailing influence of the electronic Kerr effect over the possible thermo-optical contribution is demonstrated. |
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Keywords: | Gold nanoparticles ZnO Nonlinear refraction Z-scan |
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