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酞菁铜/金属薄膜界面电位与光二次谐波特性分析
作者单位:天津大学化工学院杉山表面技术研究室,天津,300072;天津理工学院光电信息与电子工程系,天津,300191;天津大学化工学院杉山表面技术研究室,天津,300072
摘    要:

关 键 词:铜酞菁  LB膜/金属界面  Kelvin探针  表面电位  光二次谐波  空间电荷感应电场

Analysis of the Surface Potentials and the Characters of Optical Second Harmonic Generation at the CuttbPc LB Film/Metal Interface
Authors:Cheng Xiaoman  Yao Suwei
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Abstract:Using the Kelvin probe and the optical second harmonic generation (SHG) measurement, the Space charged phenomenon and the non-linear optical effects at the interfaces of the coppertetra-tert-butyl phthalocyanine (CuttbPc) Langmuir-Blodgett (LB) film deposited on a metal (AlorAu) coated glass slide substrate were in vestigated. The surface potentials decreaseas the film thickness increases and eventually approaches a saturated value. The SHG has been detected although there is a centro-symmetric systemin the Cuttb Pcmolecular, and avery strong SH signal can be investigated at 1260 nm band for Cuttb Pc/Al samples. According to a proposed physical model for Cuttb PcLB film/metal, the nonlinear mechanism were analyzed by using electromagnetic wave theory. It is considered that the enhanced SH peak of CuttbPc/Al is attributed to the strong surface potential aroused by SCIEF at the interface, and shows that the production of SH signal is correlated closely with the electrostatic phenomena at the interface.
Keywords:Coppertetra-tert-butylPhthalocyanine  Langmuir-Blodgett film/metal interface  Kelvin probe  Surface electricpotential  Optical second harmonic generation  Space charge induced electricfield            
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