Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 110, Issue 13, Pages 6692-6698Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp060173w
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Funding
- Engineering and Physical Sciences Research Council [GR/S52155/01] Funding Source: researchfish
- Medical Research Council [G0401498] Funding Source: researchfish
- MRC [G0401498] Funding Source: UKRI
- Medical Research Council [G0401498] Funding Source: Medline
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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).
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