title: Enhancement of optical nonlinearity in periodic gold nanoparticle arrays.
abstract: Linear and nonlinear optical properties of periodic triangular Au nanoparticle arrays were investigated. We compared the optical nonlinearity of periodic Au nanoparticle arrays with that of the ultra-thin gold film consisting of randomly distributed spheroidal clusters. A pronounced enhancement of the third-order nonlinear optical susceptibility χ((3)) in Au arrays was observed, and the figure of merit, χ((3))/α, of the periodic nanoparticle arrays is one order of magnitude larger than that of the ultra-thin film. Such an enhancement of the optical nonlinearity could be due to the strong local field near the triangular nanoparticles.
authors: Hong
authors: H
authors: Shen
authors: Bolin
authors: B
authors: Cheng
authors: Guowei
authors: G
authors: Lu
authors: Tingyin
authors: T
authors: Ning
authors: Dongyi
authors: D
authors: Guan
authors: Yueliang
authors: Y
authors: Zhou
authors: Zhenghao
authors: Z
authors: Chen