Influence of tip geometry on the spatial resolution of tip enhanced Raman mapping
Zhang Chao1, Chen Bao-Qin2, Li Zhi-Yuan1, †,
       

The local field enhancement (circle) and the full width half maximum of the local field intensity (cross) calculated by the conventional (black) and the modified (red) theories for various taper angles θ, where R = 25 nm, d = 2 nm, the wavelength is 532 nm.