MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072, China.
State Key Laboratory of Physical Chemistry of Solid surface, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
Sensors (Basel). 2018 Nov 9;18(11):3841. doi: 10.3390/s18113841.
We investigated tip-enhanced Raman spectra excited by high-order fiber vector beams. Theoretical analysis shows that the high-order fiber vector beams have stronger longitudinal electric field components than linearly polarized light under tight focusing conditions. By introducing the high-order fiber vector beams and the linearly polarized beam from a fiber vector beam generator based on an electrically-controlled acoustically-induced fiber grating into a top-illumination tip-enhanced Raman spectroscopy (TERS) setup, the tip-enhanced Raman signal produced by the high-order fiber vector beams was 1.6 times as strong as that produced by the linearly polarized light. This result suggests a new type of efficient excitation light beams for TERS.
我们研究了由高阶光纤矢量光束激发的尖端增强拉曼光谱。理论分析表明，在紧密聚焦条件下，高阶光纤矢量光束比线偏振光具有更强的纵向电场分量。通过在顶照明尖端增强拉曼光谱学（TERS）设置中引入基于电控制声诱导光纤光栅的光纤矢量光束发生器产生的高阶光纤矢量光束和线偏振光束，高阶光纤矢量光束产生的尖端增强拉曼信号比线偏振光强 1.6 倍。这一结果为TERS 提供了一种新型高效激发光束。
