[21a-A309-1~9] 3.11 Nanoscale optical science and near-field optics (formerly 3.12)

9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[21a-A309-1] Electric-field induced effect in tip-enhanced sum-frequency generation from nanomolecular system adsorbed on a metal surface

〇Shota Takahashi¹, Tatsuto Mochizuki^1,2, Atsunori Sakurai^1,2, Toshiki Sugimoto^1,2 (1.IMS, 2.SOKENDAI)

Keywords:

sum frequency generation,scanning tunneling microscope,plasmon

Optically excited plasmons at the apex of a metallic nanotip localize the electric field beyond the diffraction limit, significantly enhancing weak optical signals from a nanoscale domain. In this study, we focused on the tip-enhancement of sum-frequency generation and investigated the correlation between the bias voltage of the scanning tunneling microscope and the tip-enhanced sum-frequency signal. We revealed that the extremely large electrostatic field generated in the nanogap by the bias voltage significantly modulates the amplitude and phase of the sum-frequency signal.