Thermally induced nonlinear refraction of gold and silver polyvinvinylpyrrolidone nanofluid
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 pres...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
INOE Publishing House
2010
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| Online Access: | http://psasir.upm.edu.my/id/eprint/17400/1/Thermally%20induced%20nonlinear%20refraction%20of%20gold%20and%20silver%20polyvinvinylpyrrolidone%20nanofluid.pdf http://psasir.upm.edu.my/id/eprint/17400/ |
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| Summary: | 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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