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O: Fachverband Oberflächenphysik
O 71: Poster: Plasmonics and Nanooptics
O 71.8: Poster
Wednesday, March 20, 2024, 18:00–20:00, Poster D
Energy and momentum distribution of surface plasmon-induced hot carriers — •Christopher Weiß1, Tobias Eul2, Eva Prinz1, Benjamin Stadtmüller1, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern-Landau, Germany — 2Institute of Experimental and Applied Physics, University of Kiel, Germany
Are the spectroscopic properties of plasmon- and photon-induced carriers fundamentally different? This question is crucial for the advancement of plasmonic energy conversion. Electrons excited at bulk plasmon resonance show a distinct distribution in energy and momentum space [1], while the electron distribution of surface plasmon-induced carriers is still under debate [2].
To address this issue for surface plasmons, we aim to separate the energy and momentum distributions of surface plasmon polariton (SPP)-induced hot electrons from those of photoexcited ones. Exciting a circular ring-slit geometry with radially and azimuthally polarised light, we can clearly separate the plasmon and photon-induced hot carriers in space and time. Our time-resolved photoemission electron microscope (PEEM) is then able to capture their signatures in real time. In this contribution, we show that there are spectroscopic differences between photoemitted electrons and those generated by plasmoemission in the centre of the structure.
[1] Reutzel et al., Phys. Rev. Lett. 123 (2019), 017404
[2] Hartelt et al., ACS Nano 15, 12 (2021), 19559--19569
Keywords: plasmon-induced hot carriers; surface plasmon polariton; PEEM; 2-photon photoemission; momentum microscopy