ArticleACS nano2026
Construction and Regulation of a Nanometer-Femtosecond-Scale Spatiotemporally Localized Chiroptical Source in a Single Plasmonic Nanoantenna.
Article in ACS nano, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Achieving precise control over chiral light-matter interactions at the nanometer-femtosecond scale, where both spatial and temporal limits are approached, remains a central challenge in nano- and quantum optics. This control is essential for next-generation ultracompact, ultrafast chiral photonic devices, but no method has realized both the construction and the active regulation of a localized chiroptical source within a single plasmonic nanoantenna. In this study, we report a strategy for creating and dynamically controlling a spatiotemporally localized chiroptical source via plasmonic eigenmode engineering in an achiral rectangular nanoantenna. With time-resolved photoemission electron microscopy, we directly image and analyze eigenmode dynamics and interference-induced near-field chirality across the space, time, and wavelength domains, revealing polarization-dependent hotspots in the nanoantenna. An interferometric pump-probe method further enables the on/off switching and near-field chirality reversal of the chiroptical photon source between nanoantenna corners with a sub-1.37 fs time delay between pump and probe pulses. This approach also yields a tunable superchiral photon source, providing a versatile platform for integrated ultrafast chiral nanophotonic applications.
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