title: Fabrication of ultrathin films with large third-order nonlinear optical properties.
abstract: An ultrathin composite film containing anionic Ag-His complexes (His: L-Histidine) and oppositely charged BH-PPV was fabricated by means of the electrostatic layer-by-layer self-assembly technique. UV/Vis spectra showed a continuous deposition process of Ag-His complexes and BH-PPV. The film structure was characterized by using small-angle X-ray diffraction, AFM, and SEM. The nonlinear optical properties of the ultrathin film were studied by using the Z-scan technique with a laser duration of 8 ns at a wavelength of 532 nm. The film sample exhibited a strong nonlinear saturated absorption, with an alpha2 value of -3.9 x 10(-5) mW(-1) and a self-defocusing effect with an n2 value of -4.78 x 10 (-12) m2W(-1).
authors.affiliation: CAS Key Laboratory of Organic Solids, Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Jiang
authors.forename: Fushen
authors.initials: F
authors.lastname: Lu
authors.forename: Qing
authors.initials: Q
authors.lastname: Chang
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: Huibiao
authors.initials: H
authors.lastname: Liu
authors.forename: Yuliang
authors.initials: Y
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Xu
authors.forename: Guanglei
authors.initials: G
authors.lastname: Cui
authors.forename: Junpeng
authors.initials: J
authors.lastname: Zhuang
authors.forename: Xiaofang
authors.initials: X
authors.lastname: Li
authors.forename: Shu
authors.initials: S
authors.lastname: Wang
authors.forename: Yinglin
authors.initials: Y
authors.lastname: Song
authors.forename: Daoben
authors.initials: D
authors.lastname: Zhu