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Plasmonic Field Enhancement for Vibration Spectroscopy at Metal/Water Interfaces
Zhi-hua Liu, Qian Xu, Wei-tao Liu
State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures(MOE), Collaborative Innovation Center of Advanced Microstructures and Department of Physics, Fudan University, Shanghai 200433, China
Abstract:
Electrochemical (EC) reactions play vital roles in many disciplines, and its molecular-level understanding is highly desired, in particular under reactions. The vibration spectroscopy is a powerful in situ technique for chemical analysis, yet its application to EC reactions is hindered by the strong attenuation of infrared (IR) light in both electrodes and electrolytes. Here we demonstrate that by incorporating appropriate sub-wavelength plasmonic structures at the metal electrode, the IR field at the EC interface can be greatly enhanced via the excitation of surface plasmon. This scheme facilitates in situ vibrational spectroscopic studies, especially using the surface-specific sum-frequency generation technique.
Key words:  Metal water interfaces  Surface plasmon excitation  Extraordinary optical transmission
FundProject:
金属/水界面振动光谱的等离基元场增强
刘志华, 徐倩, 刘韡韬
复旦大学物理系, 应用表面物理国家重点实验室, 微纳光子结构教育部重点实验室, 先进微结构协同创新中心, 上海 200433
摘要:
电化学反应在许多学科中扮演着很重要的角色. 对于化学分析来说,振动光谱是一门很好的原位测量技术,然而由于红外光在电极和电解质中强烈的衰减使得它在电化学反应中的应用受到了很大的限制. 本文中论证了在金属电极上结合适当的亚波长等离子体结构,在OH伸缩振动频段内,通过激发表面等离激元能够大大增强金属与液态水电化学界面的红外场强. 这对于原位振动光谱的研究,特别是当用到表面灵敏的光学混频技术时可产生很大的促进作用.
关键词:  金属-水界面  表面等离子体激发  光学异常透射
DOI:10.1063/1674-0068/29/cjcp1512255
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