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| Home > Publications database > Far-field Petahertz Sampling of Plasmonic Fields |
| Preprint | PUBDB-2024-00041 |
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2023
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Please use a persistent id in citations: doi:10.48550/ARXIV.2312.16121 doi:10.3204/PUBDB-2024-00041
Abstract: The collective response of metal nanostructures to optical excitation leads to localized plasmon generation with nanoscale field confinement driving applications in e.g. quantum optics, optoelectronics, and nanophotonics, where a bottleneck is the ultrafast loss of coherence by different damping channels. The present understanding is built-up on indirect measurements dictated by the extreme timescales involved. Here, we introduce a straightforward field sampling method that allows to measure the plasmonic field of arbitrary nanostructures in the most relevant petahertz regime. We compare experimental data for colloidal nanoparticles to finite-difference-time-domain calculations, which show that the dephasing of the plasmonic excitation can be resolved with sub-cycle resolution. Furthermore, we observe a substantial reshaping of the spectral phase of the few-cycle pulse induced by this collective excitation and we demonstrate ad-hoc pulse shaping by tailoring the plasmonic sample. The results pave the way towards both a fundamental understanding of ultrafast energy transformation in nanosystems and practical applications of nanostructures in extreme scale spatio-temporal control of light.
Keyword(s): Optics (physics.optics) ; Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ; FOS: Physical sciences
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