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Thermally induced nonlinear refraction of gold and silver polyvinylpyrrolidone nanofluid

ESMAEIL SHAHRIARI1,* , W. MAHMOOD MAT YUNUS1

Affiliation

  1. Department of Physics, Universiti Putra Malaysia, 43400UPM, Serdang

Abstract

The nonlinear refractive index of metal Au and Ag nano-fluids prepared by γ-radiation method was investigated by a single beam Z-scan technique. Under CW 532 nm laser excitation with power output of 40 mW, the Au and Ag nano-fluids show a large thermal-induced nonlinear refractive index. In the present work it was determined that the nonlinear refractive index for both Ag and Au nano-fluids are -4.80×10-8 cm2 /W and -3.85×10-8 cm2 /W respectively. The values of Δn0 for both samples were also calculated to be -2.05×10-4 and -1.64×10-4 respectively. Our measurements also confirmed that the nonlinear phenomenon was caused by the self-defocusing process making them good candidates for non linear optical devices..

Keywords

Nonlinear Refractive Index; Optical Materials; Nanoparticles.

Submitted at: Oct. 22, 2010
Accepted at: Nov. 19, 2010

Citation

ESMAEIL SHAHRIARI, W. MAHMOOD MAT YUNUS, Thermally induced nonlinear refraction of gold and silver polyvinylpyrrolidone nanofluid, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 11, pp. 2306-2310 (2010)