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Nonlinear optical behaviours in a silver nanoparticle array at different wavelengths
Authors:Yu Ben-Hai  Zhang Dong-Ling  Li Ying-Bin  Tang Qing-Bin
Affiliation:College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, China
Abstract:The optical nonlinearities of an Ag nanoparticle array are investigated by performing the Z-scan measurements at the selected wavelengths (400, 600, 650, and 800 nm). The nonlinear refraction index in the resonant region (around 400 nm) exhibits a significant enhancement by two orders compared with that in the off-resonant region (around 800 nm)), and exhibits an sign alternation of the resonant nonlinear absorption, which results in a negligible nonlinear absorption at a certain excitation intensity. Moreover, a low degree of nonlinear absorption was measured at the edges of the resonant region (600 and 650 nm), which is attributed to the competition of the saturated absorption and the two-photon absorption processes.
Keywords:third-order optical nonlinearity  Ag nanoparticles  nanosphere lithography
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