Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 21: Plasmonics and Nanooptics III: Light-Matter Interaction
O 21.3: Vortrag
Montag, 20. März 2017, 17:30–17:45, TRE Ma
Relaxation of single and collective electron excitations investigated with time- and energy-resolved PEEM — •Michael Hartelt1, Anna-Katharina Mahro1, Tobias Eul1, Benjamin Frisch1, Philip Thielen1, Deirdre Kilbane1,2, 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 photoinduced and plasmon-induced hot electrons is essential for the construction of devices for plasmonic energy conversion. To distinguish between the two processes, it is advantageous to make use of the time-resolved 2-photon-photoemission (TR-2PPE) method that is an established tool for the study of hot electron lifetimes [2] in combination with Photoemission Electron Microscopy (PEEM). This allows us to study hot electron dynamics on the femtosecond and nanometer scale by analyzing the energy distribution and relaxation dynamics of the photoemitted electrons. Here, we present first results of time and energy resolved PEEM (TR-ER-PEEM) measurements of localized and propagating plasmons (LSP and SPP) with focus on the relation between spectral features and local near-field distributions.
[1] Brongersma et al., Nature nanotechnology 10.1 (2015)
[2] M. Bauer et al., Progress in Surface Science 90, 319 (2015)