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采用纳米球蚀刻法制备了Au纳米颗粒阵列.并通过扫描电子显微镜观测了其表面形貌,表明三角形的Au纳米颗粒呈阵列状分布.采用Z扫描方法(800nm,50fs)测量了Au纳米颗粒阵列的三阶非线性光学特性.在较小的激发功率下,结果呈现出双光子吸收效应,随着激发功率不断增加,出现了双光子吸收饱和的过程;非线性折射则呈现出自散焦效应.这种高效率的非线性响应机理使得该种Au纳米颗粒阵列在高速全光开关中有潜在的应用价值.
Au nanoparticle arrays were prepared by nanosphere etching and their surface morphologies were observed by scanning electron microscopy, showing that the triangular Au nanoparticles were distributed in an array. The Au nanoparticle arrays were measured by Z-scan method (800 nm, 50 fs) Order nonlinear optical properties.With the smaller excitation power, the results show two-photon absorption effect, with the increasing of the excitation power, the process of two-photon absorption saturation appears; the nonlinear refraction shows self-defocusing effect. This highly efficient nonlinear response mechanism makes the Au nanoparticle array of potential applications in high speed all-optical switches.