Combined measurement of directional Raman scattering and surface-plasmon-polariton cone from adsorbates on smooth planar gold surfaces†,Analyst

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Combined measurement of directional Raman scattering and surface-plasmon-polariton cone from adsorbates on smooth planar gold surfaces†
Analyst ( IF 3.6 ) Pub Date : 2017-09-15 00:00:00 , DOI: 10.1039/c7an01299c
Charles K. A. Nyamekye _{1,

2,

3,

4,

5} , Stephen C. Weibel _{4,

6,

7} , Jonathan M. Bobbitt _{1,

2,

3,

4,

5} , Emily A. Smith _{1,

2,

3,

4,

5}

Affiliation

Directional-surface-plasmon-coupled Raman scattering (directional RS) has the combined benefits of surface plasmon resonance and Raman spectroscopy, and provides the ability to measure adsorption and monolayer-sensitive chemical information. Directional RS is performed by optically coupling a 50 nm gold film to a Weierstrass prism in the Kretschmann configuration and scanning the angle of the incident laser under total internal reflection. The collected parameters on the prism side of the interface include a full surface-plasmon-polariton cone and the full Raman signal radiating from the cone as a function of incident angle. An instrument for performing directional RS and a quantitative study of the instrumental parameters are herein reported. To test the sensitivity and quantify the instrument parameters, self-assembled monolayers and 10 to 100 nm polymer films are studied. The signals are found to be well-modeled by two calculated angle-dependent parameters: three-dimensional finite-difference time-domain calculations of the electric field generated in the sample layer and projected to the far-field, and Fresnel calculations of the reflected light intensity. This is the first report of the quantitative study of the full surface-plasmon-polariton cone intensity, cone diameter, and directional Raman signal as a function of incident angle. We propose that directional RS is a viable alternative to surface plasmon resonance when added chemical information is beneficial.

中文翻译：

从上平滑平坦金表面吸附物定向拉曼散射和表面等离子体激元-极化锥体的组合测定†

定向表面等离子体激元耦合拉曼散射（方向性RS）具有表面等离子体共振和拉曼光谱的结合优势，并具有测量吸附和单层敏感化学信息的能力。通过将50 nm金膜光学耦合到Kretschmann配置的Weierstrass棱镜并在全内反射下扫描入射激光的角度来执行定向RS。在界面的棱镜侧收集的参数包括一个完整的表面等离激元极化锥和一个从圆锥体发出的，随入射角变化的拉曼信号。本文报道了用于进行定向RS的仪器和仪器参数的定量研究。为了测试灵敏度并量化仪器参数，研究了自组装单层膜和10至100 nm的聚合物膜。发现信号通过两个计算的角度相关参数进行了很好的建模：在样品层中生成并投影到远场的电场的三维有限差分时域计算和反射光的菲涅耳计算光强度。这是定量研究全表面等离子体激元极化强度，锥直径和方向拉曼信号随入射角变化的第一份报告。我们建议当添加化学信息有益时，定向RS是表面等离振子共振的可行替代方案。在样品层中产生并投影到远场的电场的三维有限差分时域计算和反射光强度的菲涅耳计算。这是定量研究全表面等离子体激元极化强度，锥直径和方向拉曼信号随入射角变化的第一份报告。我们建议当添加化学信息有益时，定向RS是表面等离振子共振的可行替代方案。在样品层中产生并投影到远场的电场的三维有限差分时域计算和反射光强度的菲涅耳计算。这是定量研究全表面等离子体激元极化强度，锥直径和方向拉曼信号随入射角变化的第一份报告。我们建议当添加化学信息有益时，定向RS是表面等离振子共振的可行替代方案。

更新日期：2017-09-15

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