Giant near-field nonlinear electrophotonic effects in an angstrom-scale plasmonic junction.

ABSTRACT: Plasmons facilitate a strong confinement and enhancement of near-field light, offering exciting opportunities to enhance nonlinear optical responses at the nanoscale. However, despite significant advancements, the electrically tunable range of the nonlinear optical responses at nanometer-scale plasmonic structures remains limited to a few percents per volt. Here, we transcend the limitation of the nanometer regime by expanding the concept of electrophotonics into angstrom-scale platform, enabling high-performance modulation of near-field nonlinear optical responses inaccessible in prior architectures. We demonstrate ~2000% enhancement in second-harmonic generation (SHG) within 1 V of voltage application by utilizing an angstrom-scale plasmonic gap between a metallic tip and a flat metal su

SUBMITTER: Takahashi S 

PROVIDER: S-EPMC12936104 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature