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从铜酞菁的衍生物(copper tetra-tert-butyl phthalocyanine, CuttbPc) LB 膜与金属(Al)界面处观察到较强的光二次谐波信号. 初步认为其原因是界面上所形成的空间电荷感应电场打破了分子原有的对称性. 运用四层物理模型来分析界面中的非线性光学过程, 计算出二次谐波信号强度与膜厚、偏振角及入射角的依赖关系, 与实验数据符合较好. 研究结果表明, 光二次谐波信号的产生与界面静电现象有密切关系, 可作为检测界面空间电荷感应电场、揭示其产生物理机制的有力工具. 相似文献
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As one of the most primitive nonlinear optical phenomena, optical second harmonic genera-tion (SHG) has been investigated for half a century and it has become a very useful spectroscopic tool in the study of surface and interface[1—3]. It was theoretically shown that the SH signal cannot be generated in a centrosymmetric system. However, the generation of SH signal from the centro-symmetric molecules such as fullerene (C60) and CuPc has been detected[4—7]. In our recent ex-periments, an … 相似文献
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从铜酞菁的衍生物(copper tetra-tert-butyl phthalocyanine,CuttbPc)LB膜与金属(A1)界面处观察到较强的光二次谐波信号.初步认为其原因是界面上所形成的空间电荷感应电场打破了分子原有的对称性.运用四层物理模型来分析界面中的非线性光学过程,计算出二次谐波信号强度与膜厚、偏振角及入射角的依赖关系,与实验数据符合较好.研究结果表明,光二次谐波信号的产生与界面静电现象有密切关系,可作为检测界面空间电荷感应电场、揭示其产生物理机制的有力工具. 相似文献
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Analysis of Second-Harmonic Generation from CuttbPc LB Film/Metal Interface 总被引:1,自引:0,他引:1 下载免费PDF全文
Second-harmonic generation signals from a CuttbPc LB film deposited on metal (Al or Au)-glass substrates were investigated. It was observed that there were two second-harmonic peaks at the wavelength of 1060 and 1250nm in the CuttbPc/Al film, but only one peak at 1050nm in the CuttbPc/Au film. Meanwhile the surface electric potentials (SEP) at the interfaces of LB film/metals were also measured using a Kelvin probe. The SEP in the CuttbPc/Al decreases and eventually approaches a saturated value of -1.0V as the film thickness increases, while the SEP in the CuttbPc/Au is nearly zero. Based on the experimental results and theoretical analysis, it was considered that the space-charge-induced electric field makes a main contribution to the second-harmonic generation at 1250nm in the CuttbPc/Al film. 相似文献
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李成全;王舜如;董玉芬 《力学与实践》1989,11(1):62-63,73
冷轧机机架工作应力状态的光弹性实验研究冷轧机机架在使用过程中,发现在压下螺母孔内的过渡圆弧处,机架的上横梁圆孔的侧边缘处,以及窗口圆角沟槽处,多发生开裂现象,而致使整个机架报废.为了分析其开裂原因,为轧机设备改造和为设计新轧机提供参考数据,以避免机架报废所带来的经济损失,已由沈阳重机厂、太原钢铁公司和东北重型机械学 ... 相似文献
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Measurement of Surface Potential at Metal/Organic-Material Interfaces by Electro-Absorption Method 下载免费PDF全文
The surface potential built-in vacuum deposited phthalocyanine (Pc) film on aluminium electrode is investigated by the electro-modulation method. To avoid the influence of charge injection, a sandwiched cell (Al-Pc-air-ITO) is fabricated. The modulation signal, which depends on the external electric field intensity, is detected.The properties of electro-absorption (EA) and electro-reflectance (ER) signals are analysed. The existence of the surface potential at the metal/organic-material interface induces i f referenced ER signals. As a result, the surface potential built across the vacuum-deposited Pc film on the aluminium electrode is estimated to be 1.23 V. 相似文献
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