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Nonlinear optical behaviours in a silver nanoparticle array at different wavelengths |
Yu Ben-Hai (余本海), Zhang Dong-Ling (张东玲), Li Ying-Bin (李盈傧), Tang Qing-Bin (汤清彬) |
College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, China |
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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.
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Received: 08 April 2012
Revised: 19 June 2012
Accepted manuscript online:
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PACS:
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42.70.Nq
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(Other nonlinear optical materials; photorefractive and semiconductor materials)
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78.67.Bf
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(Nanocrystals, nanoparticles, and nanoclusters)
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81.16.Nd
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(Micro- and nanolithography)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11005088 and 11047145), the Science and Technology Project of Henan Province, China (Grant Nos. 102300410241 and 112300410021), and the Scientific Research Foundation of Education Department of Henan Province, China (Grant No. 2011B140018). |
Corresponding Authors:
Yu Ben-Hai
E-mail: hnyubenhai@163.com
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Cite this article:
Yu Ben-Hai (余本海), Zhang Dong-Ling (张东玲), Li Ying-Bin (李盈傧), Tang Qing-Bin (汤清彬) Nonlinear optical behaviours in a silver nanoparticle array at different wavelengths 2013 Chin. Phys. B 22 014212
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