Geometrical effects of plasmonic tips (IMAGE)
Caption
(Upper panel) Scanning electron micrographs of the tips used in the tip-enhanced SHG measurements. Zoomed-in views of the regions indicated by white squares in (a), (d), and (g) are shown in (b), (e), and (h), respectively. (Middle panel) The intensities of tip-enhanced SHG obtained for the corresponding tips. Structural differences in nanometer-scale tip apex and micrometer-scale tip shafts give rise to the variation in the spectral property of SHG enhancement. (Lower panel) The excitation wavelength dependence of the tip-enhanced SHG intensity calculated for the tips shown in the upper panel. The calculated results excellently capture the characteristics of the observed tip-enhanced SHG.
Credit
Toshiki Sugimoto
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