Meng Lingyan, Sun Mengtao, Chen Jianing, Yang Zhilin
Department of Physics, Xiamen University, Xiamen 361005, China.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
Sci Rep. 2016 Jan 19;6:19558. doi: 10.1038/srep19558.
We theoretically investigate an optimized tip-film system that supports in-situ measurement of tip-enhanced Raman spectroscopy (TERS) and tip-enhanced fluorescence (TEF) of dye molecules. A scanning tunneling microscope (STM) is proposed to precisely control the tip-film distance, and thus in-situ measurement of TERS and TEF can be realized utilizing the specific surface plasmon resonance (SPR) properties of the tip-film system. Our calculations show that the optimized tip-film distance of 2 nm suggests a possibility of efficient acquisition of TERS and TEF in-situ. The calculated spatial resolution of TERS and spectral resolution of TEF can be down to 6.5 nm and 10 nm, respectively. Our theoretical results may find promising application in developing multiple functional nano-spectroscopy through which Raman and fluorescence can be measured in-situ at the nanoscale level.
我们从理论上研究了一种优化的针尖-薄膜系统，该系统支持对染料分子进行针尖增强拉曼光谱（TERS）和针尖增强荧光（TEF）的原位测量。提出了一种扫描隧道显微镜（STM）来精确控制针尖-薄膜距离，从而利用针尖-薄膜系统的特定表面等离子体共振（SPR）特性实现TERS和TEF的原位测量。我们的计算表明，2纳米的优化针尖-薄膜距离表明原位高效获取TERS和TEF具有可能性。计算得出的TERS空间分辨率和TEF光谱分辨率分别可低至6.5纳米和10纳米。我们的理论结果可能在开发多功能纳米光谱学方面找到有前景的应用，通过该光谱学可以在纳米尺度水平原位测量拉曼光谱和荧光光谱。
