Nonlinear Coefficient Determination of Au/Pd Bimetallic Nanoparticles Using Z-Scan

José Luis Jiménez Pérez, Rubén Gutiérrez-Fuentes, José Francisco Sánchez Ramírez, Omar Uriel García Vidal, Daniel Erick Téllez-Sánchez, Zormy Nacary Correa Pacheco, Alfredo Cruz Orea, Jesús Antonio Fuentes García

Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, México D.F., México.
Departamento de Física, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, México, D.F., México.
Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas del IPN, México, D.F., México.

DOI: 10.4236/anp.2013.23031                

Abstract

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.

Keywords

Nanofluids; Nanoparticles; Nonlinear Refractive Indices; Z-Scan

Conflicts of Interest

The authors declare no conflicts of interest.

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