Wavelengths effect on nonlinear refraction of copper nanoparticles suspension

Abstract

In this paper, the linear and nonlinear refraction optical properties of suspended Cu nanoparticles of 20 nm particle size have been studied by using different laser wavelengths. The nonlinearity of the Cu nanoparticles has been examined by z-scan technique. The linear absorbance spectra of the Cu nanoparticles do not show any high scale noticeable absorption peaks over the entire visible band. The results show that the Cu nanoparticles have a negative nonlinear refractive index at all the used wavelengths with a relatively significant value of the nonlinear refractive index. In this research the results show that nonlinear refractive index has maximum absolute value 5.88×10−11 m2/W at 405 nm and minimum absolute value 0.924×10-11 m2/W at 650 nm. The present results indicate that the suspension of Cu nanoparticles can be a good candidate for many optoelectronic devices that depend on nonlinear optical properties.