酞菁铜/金属薄膜界面电位与光二次谐波特性分析 |
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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 |
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摘 要: |
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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 |
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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. |
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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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