Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Wednesday: Plasmonics and Nanooptics 2
O 59.4: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
Energy and momentum distribution of surface plasmon- induced hot carriers — •Christopher Weiß1, Eva Prinz1, Michael Hartelt1, Benjamin Stadtmüller1,2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Germany — 2Institute of Physics, Johannes Gutenberg University Mainz, Germany
Investigating the energy and momentum space signature of plasmon-induced hot electrons is essential for understanding novel plasmonic energy conversion schemes. The question remains, if plasmon-induced and photon-induced hot carriers are fundamentally different. For the bulk plasmon resonance, a fundamental difference is known, yet for the technologically important surface plasmons this is far from being settled. Just recently, we identified a similar characteristic signature in the surface plasmon polariton (SPP) emission that distinguishes them from photon-induced electrons [1].
To separate the energy and momentum distribution of the plasmon-induced hot electrons from those of the photoexcited electrons, we employ a two-colour femtosecond time-resolved 2-photon photoemission (2PPE) experiment. The spatial evolution of the photoemitted electrons was observed with energy-resolved photoemission electron microscopy (PEEM) and momentum microscopy during the propagation of an SPP pulse along a gold surface. Building on these findings, we extend this concept to SPPs of single crystalline silver surfaces to investigate the influence of the band structure and material properties.
[1] Hartelt et al., ACS Nano 15, 12 (2021), 19559--19569