Finite element simulations of tip-enhanced Raman and fluorescence spectroscopy

被引:89
作者
Downes, A
Salter, D
Elfick, A
机构
[1] Univ Edinburgh, Inst Mat & Proc, Edinburgh EH9 3JL, Midlothian, Scotland
[2] Univ Edinburgh, Queens Med Res Inst, Edinburgh EH16 4TJ, Midlothian, Scotland
基金
英国医学研究理事会; 英国工程与自然科学研究理事会;
关键词
D O I
10.1021/jp060173w
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Finite element electromagnetic simulations of scanning probe microscopy tips and substrates are presented. The enhancement of the scattered light intensity is found to be as high as 10(12) for a 20 nm radius gold tip, and tip-substrate separation of 1 mn. Molecular resolution imaging (< 1 nm) is achievable, even with a relatively large radius tip (20 nm). We also make predictions for imaging in aqueous environments, noting a sizable red shift of the spectral peaks. Finally, we discuss signal levels, and predict that high-speed Raman mapping should be possible with gold substrates and a small tip-substrate separation (< 4 nm).
引用
收藏
页码:6692 / 6698
页数:7
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