Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 77: Poster: Plasmonics and Nanooptics
O 77.9: Poster
Wednesday, March 14, 2018, 18:15–20:30, Poster A
Spatial and temporal separation of plasmon-induced hot carriers by time- and energy-resolved PEEM — •Michael Hartelt1, Anna-Katharina Mahro1, Tobias Eul1, Benjamin Frisch1, Eva Prinz1, Deirdre Kilbane1,2, Benjamin Stadtmüller1, Mirko Cinchetti1,3, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Germany — 2School of Physics, University College Dublin, Ireland — 3Experimentelle Physik VI, Fakultät Physik, TU Dortmund, Germany
The generation of hot carriers through the internal decay of plasmons in metallic materials has received considerable attention lately, due to its wide range of potential applications [1]. Understanding the differences between photo-induced and plasmon-induced hot electrons is essential for the construction of devices for plasmonic energy conversion. We use a two-color femtosecond pump-probe scheme in time-resolved 2-photon-photoemission (TR-2PPE) to address the population dynamics of excited electrons in metals. We are able to separate the spectroscopic signature of the pure plasmon-induced hot carriers from that of directly photo-excited carriers by following the spatial evolution of photoemitted electrons with energy-resolved Photoemission Electron Microscopy (PEEM) during the propagation of a Surface Plasmon Polariton (SPP) along an Au surface. This allows us to study plasmon-induced hot carrier dynamics on the femtosecond and nanometer scale.
[1] Brongersma et al., Nature nanotechnology 10.1 (2015)