中国物理B ›› 2016, Vol. 25 ›› Issue (9): 95203-095203.doi: 10.1088/1674-1056/25/9/095203

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Influence of tip geometry on the spatial resolution of tip enhanced Raman mapping

Chao Zhang(张超), Bao-Qin Chen(陈宝琴), Zhi-Yuan Li(李志远)   

  1. 1. Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2. College of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
  • 收稿日期:2016-02-23 修回日期:2016-05-24 出版日期:2016-09-05 发布日期:2016-09-05
  • 通讯作者: Zhi-Yuan Li E-mail:lizy@aphy.iphy.ac.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 11434017) and the National Basic Research Program of China (Grant No. 2013CB632704).

Influence of tip geometry on the spatial resolution of tip enhanced Raman mapping

Chao Zhang(张超)1, Bao-Qin Chen(陈宝琴)2, Zhi-Yuan Li(李志远)1   

  1. 1. Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2. College of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
  • Received:2016-02-23 Revised:2016-05-24 Online:2016-09-05 Published:2016-09-05
  • Contact: Zhi-Yuan Li E-mail:lizy@aphy.iphy.ac.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 11434017) and the National Basic Research Program of China (Grant No. 2013CB632704).

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摘要：

In 2013, a breakthrough experiment pushed the Raman mapping of molecules via the tip-enhanced Raman scattering (TERS) technique to a sub-nanometer spatial resolution, going into the single-molecule level. This surprising result was well explained by accounting for the critical role of elastic molecule Rayleigh scattering within a plasmonic nanogap in enhancing both the localization and the intensity level of the Raman scattering signal. In this paper, we theoretically explore the influence of various geometric factors of the TERS system on the spatial resolution of Raman mapping, such as the tip curvature radius, tip conical angle, tip-substrate distance, and tip-molecule vertical distance. This investigation can help to find out the most critical geometric factor influencing the spatial resolution of TERS and march along in the right direction for further improving the performance of the TERS system.

关键词: tip-enhanced Raman scattering, Rayleigh scattering, surface plasmon resonance

Abstract:

In 2013, a breakthrough experiment pushed the Raman mapping of molecules via the tip-enhanced Raman scattering (TERS) technique to a sub-nanometer spatial resolution, going into the single-molecule level. This surprising result was well explained by accounting for the critical role of elastic molecule Rayleigh scattering within a plasmonic nanogap in enhancing both the localization and the intensity level of the Raman scattering signal. In this paper, we theoretically explore the influence of various geometric factors of the TERS system on the spatial resolution of Raman mapping, such as the tip curvature radius, tip conical angle, tip-substrate distance, and tip-molecule vertical distance. This investigation can help to find out the most critical geometric factor influencing the spatial resolution of TERS and march along in the right direction for further improving the performance of the TERS system.

Key words: tip-enhanced Raman scattering, Rayleigh scattering, surface plasmon resonance

中图分类号:  (Rayleigh scattering; stimulated Brillouin and Raman scattering)

  • 52.38.Bv
78.30.-j (Infrared and Raman spectra) 73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))