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Schematic setup of the experiment for the near-field excitation and near-field collection of SPPs wave at Au/air interface. The inset 1 is the SEM picture of the ring-shaped groove and the inset 2 gives the cross section of the ring-shaped groove.
NSOM images of the SPPs distribution on the ring-shaped groove structure with ring diameter and the excitation probe diameter . (a) , ; (b) , ; (d) , . (c) The upper line and lower line correspond to the intensity distribution of SPPs along the lines in Figs. 2(a) and 2(b), respectively.
(a) The schematic map of the ring-shaped groove and different excitation positions. (b), (c), (d), and (e) NSOM images of the SPPs distribution on the sample with excitation position at b, c, d, and e along the red line shown in Fig. 3(a). (f) Numerical calculations of the energy distribution corresponding to Fig. 3(d).
(a) The SPPs distribution between the excitation probe and the metal edge. (b) The intensity distribution along the line in Fig. 4(a) gives an interference period of about 320 nm.
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