Nonlinear optical behaviors in a silver nanoparticle array at different wavelengths

Nonlinear optical behaviors in a silver nanoparticle array at different wavelengths
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不同波长下银纳米粒子阵列的非线性光学行为

DOI:
10.1088/1674-1056/22/1/014212
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发表时间:
2013
期刊:
影响因子:
1.7
通讯作者:
Tang Qing-Bin
Tang Qing-Bin
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Yu Ben-Hai;Zhang Dong-Ling;Li Ying-Bin;Tang Qing-Bin

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通过在选定的波长(400,600,650和800 nm)进行Z-扫描测量的Ag纳米颗粒阵列的光学非线性进行了研究。共振区(400 nm附近)的非线性折射率比非共振区(800 nm附近)的非线性折射率显著提高了两个数量级,并且共振非线性吸收呈现符号交替,在一定的激发强度下,非线性吸收可以忽略不计。此外,在共振区(600和650 nm)的边缘处测量到低程度的非线性吸收,这归因于饱和吸收和双光子吸收过程的竞争。
The optical nonlinearities of an Ag nanoparticle array are investigated by performing 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.
银纳米线偏光玻璃的线性和非线性光学特性
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