Figure 2: Giant electric modulation of SHG. (IMAGE)

National Institutes of Natural Sciences

Figure 2: Giant electric modulation of SHG.

Caption

The voltage-dependent change in the SHG intensity (ΔITESHG (V)) normalized by the signal intensity at V = 0 V (ΔITESHG (V)) is depicted by blue open circles. The modulation depth of ~2000% is achieved at a bias voltage of ±1 V. The orange curve is the result of curve fitting with a quadratic function. The measurements were performed in the backward-scattering geometry under constant excitation intensity (0.5 mW) and constant tip-substrate distance (~7 Å).

Credit

Adapted from Takahashi et al. (2026), Nature Communications

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