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首页> 外文期刊>The Journal of Chemical Physics >Experimental evidence for an optical interference model for vibrational sum frequency generation on multilayer organic thin film systems. I. Electric dipole approximation
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Experimental evidence for an optical interference model for vibrational sum frequency generation on multilayer organic thin film systems. I. Electric dipole approximation

机译：在多层有机薄膜系统上产生振动和频率的光学干涉模型的实验证据。 I.电偶极近似

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摘要

In the field of vibrational sum frequency generation spectroscopy (VSFG) applied to organic thin film systems, a significant challenge to data analysis is in the accurate description of optical interference effects. Herein, we provide experimental evidence that a model recently developed in our lab provides an accurate description of this phenomenon. We studied the organic small molecule N,N'-dioctyl-3,4,9,10-perylenedicarboximide vapor deposited as a thickness gradient on silicon wafer substrates with two oxide thicknesses and two surface preps. VSFG data were obtained using the ssp and the sps polarization combinations in the imide carbonyl stretching region as a function of organic thickness. In this first of two reports, the data are modeled and interpreted within the ubiquitous electric dipole approximation for VSFG. The intrinsic sample responses are parameterized during the fitting routines while optical interference effects are simply calculated from the model using known refractive indices, thin film thicknesses, and beam angles. The results indicate that the thin film model provides a good description of optical interferences, indicating that interfacial terms are significant. Inconsistencies between the fitting results within the bounds of the electric dipole response motivate deliberation for additional effects to be considered in the second report. (C) 2015 AIP Publishing LLC.
机译：在应用于有机薄膜系统的振动和频率产生光谱（VSFG）领域中，对数据分析的重大挑战在于对光学干涉效应的准确描述。在此，我们提供实验证据，证明我们实验室中最近开发的模型可以对这种现象进行准确的描述。我们研究了有机小分子N，N'-二辛基-3,4,9,10-per基二boxboximide气相沉积作为厚度梯度在具有两个氧化物厚度和两个表面准备的硅片基板上。使用酰亚胺羰基拉伸区域中的ssp和sps极化组合作为有机物厚度的函数获得VSFG数据。在这两个报告的第一篇中，在VSFG普遍存在的电偶极子近似值内对数据进行了建模和解释。在拟合例行程序中对固有样本响应进行参数设置，同时使用已知的折射率，薄膜厚度和光束角从模型中简单计算出光学干涉效应。结果表明，薄膜模型可以很好地描述光学干涉，表明界面项很重要。电偶极子响应范围内的拟合结果之间的不一致会促使人们考虑在第二份报告中考虑其他影响。 （C）2015 AIP Publishing LLC。

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