Cited by 37Laser-Matter Interactions and ApplicationsPlasmonic and Surface Plasmon ResearchGold and Silver Nanoparticles Synthesis and Applications

Momentum Distribution of Electrons Emitted from Resonantly Excited Individual Gold Nanorods

Lehr, Martin, Foerster, Benjamin, Schmitt, Mathias, Krüger, Katja, Sönnichsen, Carsten, Schönhense, Gerd, Elmers, Hans-Joachim·2017·Nano Letters

Abstract

Electron emission by femtosecond laser pulses from individual Au nanorods is studied with a time-of-flight momentum resolving photoemission electron microscope (ToF k-PEEM). The Au nanorods adhere to a transparent indium-tin oxide substrate, allowing for illumination from the rear side at normal incidence. Localized plasmon polaritons are resonantly excited at 800 nm with 100 fs long pulses. The momentum distribution of emitted electrons reveals two distinct emission mechanisms: a coherent multiphoton photoemission process from the optically heated electron gas leads to an isotropic emission distribution. In contrast, an additional emission process resulting from the optical field enhancement at both ends of the nanorod leads to a strongly directional emission parallel to the nanorod's long axis. The relative intensity of both contributions can be controlled by the peak intensity of the incident light.

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Crossref · 10.1021/acs.nanolett.7b02434

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  • Spatial symmetries in plasmonic hot spot regions influence vector momentum distributions of photoexcited carriers, enabling optical generation and active control of directional transient currents down to the nanoscale.

    “Corresponding spatial symmetries in these hot spot regions influence the vector momentum distributions of photoexcited carriers187,189,190, leading to new capabilities for optically generating and actively controlling directional transient currents down to the nanoscale.”

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Authors
Lehr, M., Foerster, B., Schmitt, M., Krüger, K., Sönnichsen, C., Schönhense, G., & Elmers, H.-J.
Affiliations
Johannes Gutenberg University Mainz (DE)
Corresponding author
Lehr, Martin
Venue
Nano Letters
Published
2017-10-26
Volume
17
Issue
11
Pages
6606-6612
ISSN
  • 1530-6984 (ISSN-L)
  • 1530-6992
OpenAlex
W2766656962
Cited by
37
References
59
Citations by year
2026: 2 · 2025: 2 · 2024: 3 · 2023: 7 · 2022: 3 · 2021: 5 · 2020: 6 · 2019: 5 · 2018: 4
FWCI
2.01
Type
journal article
Language
en
Open access
closed
Locations
  • Nano Letters (publishedVersion)
  • PubMed (publishedVersion)
Funders
Deutsche Forschungsgemeinschaft (SFB/TR 173, SPP 1391)
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
  • Physical Sciences › Engineering › Biomedical Engineering › Plasmonic and Surface Plasmon Research
  • Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Gold and Silver Nanoparticles Synthesis and Applications
Keywords
gold nanorods, electron emission, momentum distribution, femtosecond laser excitation, localized surface plasmons, resonant excitation, multiphoton photoemission, field enhancement, plasmon polaritons

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