Thermally induced nonlinear refraction of gold and silver polyvinvinylpyrrolidone nanofluid
Esmaeil, Shahriari and Mat Yunus, Wan Mahmood (2010) Thermally induced nonlinear refraction of gold and silver polyvinvinylpyrrolidone nanofluid. Journal of Optoelectronics and Advanced Materials, 12 (11). pp. 2306-2310. ISSN 1454-4164
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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.
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