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Third Order Optical Nonlinearity of Silver Nanoparticles Prepared by Chemical Reduction Method | ||
| Journal of Al-Nahrain University - Science | ||
| Article 1, Volume 20, Issue 3, 2017, Pages 99-104 | ||
| Author | ||
| Hussein T. Salloom | ||
| Abstract | ||
| In this study, silver colloidal nanoparticles have been prepared by chemical reduction of silver nitrate by trisodium citrate as a reduction agent. The adding time of the reduction agent was held constant while the time of stirring was varied. The resulting silver nanoparticles were characterized by UV-VIS absorption spectroscopy. The non-linear refractive index and absorption coefficient of silver nanoparticles were investigated using a single beam z-scan technique. The excitation source was a continuous wave (CW) of 532 nm diode laser with a beam power of 40 mW. All investigated samples showed negative and large thermally-induced non-linear refractive indices. Other nonlinear optical parameters (i.e.β,χ_r^((3)),χ_i^((3))) were also calculated. Our measurements confirm that the non-linear parameters are caused by self-defocusing process making them potential candidates for nonlinear optical devices. | ||
| Keywords | ||
| Silver colloidal nanoparticles; chemical reduction; nonlinear optical parameters; scan | ||
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