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(Color online) (a) Experimental setup for a tip-enhanced near field Raman system using tapping-mode AFM. (b) Schematic of the dual-gating photon counting scheme.
(Color online) (a) Tip-enhanced near field Raman intensity of SWCNTs measured while scanning one of two gates through the entire tapping period (spherical dots: a vibrational frequency of the band at ; squared dots: no vibrational frequency at ). (b) Dependence of tip-SWCNTs distance on tip-enhanced near field Raman intensity of the band represented from (a).
(Color online) [(a) and (b)] Tip-SWCNTs distance dependent Raman intensities of the -band which were measured with different silver tips (tip A and tip B). Both of the tips were prepared by the mirror reaction method under same chemical conditions.
(Color online) Distance dependent Raman intensities of a vibrational mode of 4-ATP at which were measured on (a) silver-coated substrate and (b) nonsilver-coated substrate with the use of the same silver tip. The data of (b) are presented with a 100 times larger scale in (c) for a better comparison of the decay lengths.
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