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
Chao Zhang(张超), Bao-Qin Chen(陈宝琴), Zhi-Yuan Li(李志远)
Chao Zhang(张超)1, Bao-Qin Chen(陈宝琴)2, Zhi-Yuan Li(李志远)1
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.
中图分类号: (Rayleigh scattering; stimulated Brillouin and Raman scattering)