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

doi:10.1088/1674-1056/25/9/095203

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.

Keywords: tip-enhanced Raman scattering Rayleigh scattering surface plasmon resonance

Received: 23 February 2016
Revised: 24 May 2016
Accepted manuscript online:

PACS:	52.38.Bv	(Rayleigh scattering; stimulated Brillouin and Raman scattering)
	78.30.-j	(Infrared and Raman spectra)
	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

Fund:

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

Corresponding Authors: Zhi-Yuan Li
E-mail: lizy@aphy.iphy.ac.cn

Cite this article:

Chao Zhang(张超), Bao-Qin Chen(陈宝琴), Zhi-Yuan Li(李志远) Influence of tip geometry on the spatial resolution of tip enhanced Raman mapping 2016 Chin. Phys. B 25 095203

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