ANP  Vol.2 No.3 , August 2013
Nonlinear Coefficient Determination of Au/Pd Bimetallic Nanoparticles Using Z-Scan

In this paper we present the nonlinear optical characterization of Au/Pd nanoparticles in order to obtain the nonlinear refractive indices using the Z-scan technique. The experiments were performed using a 514 nm laser beam Ar+, with 14 Hz of modulation frequency, as excitation source. By using a lens the excitation beam was focused to a small spot and the sample was moved across the focal region along the z-axis by a motorized translation stage. Seven samples with different concentration ratio of Au/Pd nanoparticles were prepared by simultaneous reduction of gold and palladium ions in presence of poly (N-vinyl-2-pirrolidone) (PVP) using ethanol as a reducing agent. In this work, we report the application of the Z-scan technique, to generate optical transmission of laser light as a function of the z position for solutions containing bimetallic nanoparticles of Au (core)/Pd (shell) with average sizes ranging from 3 to 5 nm. The magnitude of the obtained nonlinear refractive index was in the order of 10?8 cm2/W. Our results show that the nonlinear refractive index has a nonlinear behavior when the (Au/Pd) ratio was increased.

Cite this paper
Pérez, J. , Gutiérrez-Fuentes, R. , Ramírez, J. , Vidal, O. , Téllez-Sánchez, D. , Pacheco, Z. , Orea, A. and García, J. (2013) Nonlinear Coefficient Determination of Au/Pd Bimetallic Nanoparticles Using Z-Scan. Advances in Nanoparticles, 2, 223-228. doi: 10.4236/anp.2013.23031.
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