中国激光, 2005, 32 (2): 188, 网络出版: 2006-06-01
AgOx型超分辨近场结构的非线性光学特性研究
Investigation on Nonlinear Optical Properties of AgOx-Type Super-Resolution Near-Field Structure
非线性光学 超分辨近场结构 Z扫描 AgOx薄膜 nonlinear optics AgOx super-resolution near-field structure Z-scan AgOx film
摘要
采用共焦Z扫描系统,以λ=532 nm,脉冲宽度0.7 ns,重复频率15.79 kHz的脉冲半导体激光器作为入射光源,研究了AgOx超分辨近场结构(SuperRENS)薄膜样品的非线性光学性质,实验获得了其三阶非线性折射率系数随入射光功率的变化曲线,并与Au,Ag薄膜作了比较,讨论了光致非线性变化过程。结果表明,在聚焦激光作用下,AgOx超分辨近场结构薄膜样品存在一相变点,即解析出纳米Ag颗粒,满足了产生局域表面等离子体的激发和增强效应的条件。
Abstract
The nonlinear optical properties of the AgOx-type super-resolution near-field structure (SuperRENS) films were studied using confocal Z-scan technique with 0.7 ns, 532 nm laser pulses. Nonlinear refractive indexes at different laser power were obtained through close-aperture Z-scan and compared with the measured results of Au film and Ag film, The mechanisms of this change due to the photochemical reaction, thermal effects and optical response were discussed. The experimental results show that heat by laser illumination causes a phase transition, so results in the enhancement of the localized surface plasmon of dissociated Ag nanoparticles.
王沛, 鲁拥华, 唐麟, 章江英, 明海, 何符汉, 张勋豪, 蔡定平. AgOx型超分辨近场结构的非线性光学特性研究[J]. 中国激光, 2005, 32(2): 188. 王沛, 鲁拥华, 唐麟, 章江英, 明海, 何符汉, 张勋豪, 蔡定平. Investigation on Nonlinear Optical Properties of AgOx-Type Super-Resolution Near-Field Structure[J]. Chinese Journal of Lasers, 2005, 32(2): 188.