Fabrication of Ultrathin Films with Large Third-Order Nonlinear Optical Properties

✍ Scribed by Li Jiang; Fushen Lu; Qing Chang; Yang Liu; Huibiao Liu; Yuliang Li; Wei Xu; Guanglei Cui; Junpeng Zhuang; Xiaofang Li; Shu Wang; Yinglin Song; Daoben Zhu

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 216 KB
• Volume: 6
• Category: Article
• ISSN: 1439-4235
• DOI: 10.1002/cphc.200400404

✦ Synopsis

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__ α~2~ value of −3.9×10^−5^ m W^−1^ and a self‐defocusing effect with an n~2~ value of −4.78×10^−12^ m^2^ W^−1^.