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Tip-Enhanced Second Harmonic Generation From a Single NaNbO3 Nanocrystal

We demonstrated the enhanced second harmonic generation (SHG) from a single sodium niobate (NaNbO3) nanocrystal by approaching a metal tip on top of it. By scanning a laser-focused NaNbO3 nanocrystal with a gold-coated tip, the mapping of the enhanced SHG from the nanocrystal was obtained. We observed that the SHG of the single NaNbO3 nanocrystal was strongly enhanced with the gold-coated tip on the top of it. And the enhancement factor showed strong dependence on the excitation polarization and the excitation power. An over 12-fold tip enhancement was observed when the excitation power was 12 mW.