SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 80: Plasmonics and Nanooptics IV: Light-Matter Interaction and Spectroscopy III
O 80.1: Vortrag
Donnerstag, 30. März 2023, 15:00–15:15, CHE 89
Energy and momentum distribution of surface plasmon-induced hot carriers — •Christopher Weiß1, Michael Hartelt1, Pavel N. Terekhin1, Tobias Eul1, Anna-Katharina Mahro1, Benjamin Frisch1, Eva Prinz1, Baerbel Rethfeld1, Benjamin Stadtmüller1,2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Germany — 2Institute of Physics, Johannes Gutenberg University Mainz, Germany
Are the spectroscopic properties of plasmon- and photon-induced hot carriers fundamentally different? Electrons excited at the bulk plasmon resonance, for example, exhibit a distinct spectroscopic signature [1]. However, bulk plasmons are rather unsuited for technological applications compared to surface plasmons.
To answer the initial question for surface plasmons, we separate the energy and momentum distributions of surface plasmon polariton (SPP)-induced hot electrons from those of photoexcited electrons in a two-color time-resolved photoemission electron microscopy experiment.
In our experiment, these SPP-induced hot electrons show only small momenta parallel to the surface and a narrow energy distribution close to the Fermi energy [2]. This result clearly distinguishes them spectroscopically from their photoinduced counterparts.
[1] Reutzel et al., Phys. Rev. Lett. 123 (2019), 017404
[2] Hartelt et al., ACS Nano 15, 12 (2021), 19559--19569