Tip-enhanced second harmonic generation (IMAGE)

National Institutes of Natural Sciences

Tip-enhanced second harmonic generation — Caption

(a) Schematic representation of the experiment. Local SHG signal is enhanced by irradiating an infrared laser pulse into the plasmonic nanogap between the gold tip and the gold substrate. (b) SHG spectra obtained with (red) and without (orange) plasmonic nanogap, indicating that the SHG signal is enhanced only when the tip is brought closer due to the plasmonic enhancement effect unique to the tip-substrate nanocavity.

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Toshiki Sugimoto

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