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Imaging Plasmon Hybridization of Fano Resonances via Hot-Electron-Mediated Absorption Mapping

Simoncelli, S; Li, Y; Cortes, E; Maier, SA; (2018) Imaging Plasmon Hybridization of Fano Resonances via Hot-Electron-Mediated Absorption Mapping. Nano Letters , 18 (6) pp. 3400-3406. 10.1021/acs.nanolett.8b00302. Green open access

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Abstract

The inhibition of radiative losses in dark plasmon modes allows storing electromagnetic energy more efficiently than in far-field excitable bright-plasmon modes. As such, processes benefiting from the enhanced absorption of light in plasmonic materials could also take profit of dark plasmon modes to boost and control nanoscale energy collection, storage, and transfer. We experimentally probe this process by imaging with nanoscale precision the hot-electron driven desorption of thiolated molecules from the surface of gold Fano nanostructures, investigating the effect of wavelength and polarization of the incident light. Spatially resolved absorption maps allow us to show the contribution of each element of the nanoantenna in the hot-electron driven process and their interplay in exciting a dark plasmon mode. Plasmon-mode engineering allows control of nanoscale reactivity and offers a route to further enhance and manipulate hot-electron driven chemical reactions and energy-conversion and transfer at the nanoscale.

Type: Article
Title: Imaging Plasmon Hybridization of Fano Resonances via Hot-Electron-Mediated Absorption Mapping
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acs.nanolett.8b00302
Publisher version: https://doi.org/10.1021/acs.nanolett.8b00302
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Technology, Chemistry, Multidisciplinary, Chemistry, Physical, Nanoscience & Nanotechnology, Materials Science, Multidisciplinary, Physics, Applied, Physics, Condensed Matter, Chemistry, Science & Technology - Other Topics, Materials Science, Physics, Fano resonances, dark modes, hot-electrons, super-resolution, self-assembly, nanoscale precision, ELECTROMAGNETICALLY INDUCED TRANSPARENCY, MICROSCOPY REVEALS, NANOANTENNAS, SUPERRESOLUTION, NANOSTRUCTURES, METAMATERIALS, SPECTROSCOPY, LOCALIZATION, NANOCAVITIES, GENERATION
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/10089401
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