title: Third-order nonlinear optical properties of an ultrathin film containing a porphyrin derivative.
abstract: An ultrathin nanoscopic multilayer film has been fabricated through the electrostatic layer-by-layer self-assembly of negatively charged 5,10,15,20-tetrakis(3,4,5-trihydroxyphenyl)porphyrin (DHP) and oppositely charged polyethylenimine (PEI). UV-vis spectra showed a continuous and uniform deposition process of PEI and DHP. The film structure was characterized by small-angle X-ray diffraction measurement and AFM images. The nonlinear optical properties of ultrathin film were studied by Z-scan technique with laser duration of 8 ns at a wavelength of 532 nm. The film sample exhibited strong nonlinear saturated absorption and a self-defocusing effect. The nonlinear absorption coefficient and refractive index of the self-assembly ultrathin film are -9.7 x 10(-5) m/W and -7.56 x 10(-12) m(2)/W, respectively.
authors.affiliation: CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, P. R. China.
authors.forename: Li
authors.initials: L
authors.lastname: Jiang
authors.forename: Fushen
authors.initials: F
authors.lastname: Lu
authors.forename: Hongmei
authors.initials: H
authors.lastname: Li
authors.forename: Qing
authors.initials: Q
authors.lastname: Chang
authors.forename: Yuliang
authors.initials: Y
authors.lastname: Li
authors.forename: Huibiao
authors.initials: H
authors.lastname: Liu
authors.forename: Shu
authors.initials: S
authors.lastname: Wang
authors.forename: Yinglin
authors.initials: Y
authors.lastname: Song
authors.forename: Guanglei
authors.initials: G
authors.lastname: Cui
authors.forename: Ning
authors.initials: N
authors.lastname: Wang
authors.forename: Xiaorong
authors.initials: X
authors.lastname: He
authors.forename: Daoben
authors.initials: D
authors.lastname: Zhu