Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 83: Poster Session - Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy
O 83.11: Poster
Wednesday, March 18, 2020, 18:15–20:00, P2/EG
Plasmoemission from a Plasmonic Nanofocus — •Jan-Henrik Herrig, Pascal Dreher, David Janoschka, Ping Zhou, Michael Horn-von Hoegen, and Frank Meyer zu Heringdorf — Faculty of Physics, University of Duisburg-Essen, Germany
Nonlinear photoemission from metal surfaces can be manipulated by strong plasmonic fields that are present during the emission process. Electron emission exclusively from such strong plasmonic fields (plasmoemission) can be distinguished from photoemission by spatio-temporal separation [1]. Obtaining the necessary field intensities requires efficient excitation of strong plasmonic fields.
We employed amplified laser pulses to excite surface plasmon polaritons in Archimedean spirals [2], which transiently form a diffraction-limited nanofocus if illuminated by circularly polarized light of the appropriate handedness. Plasmonic field intensities on the order of 1013 W/cm2 were obtained at the Au(111) surface. The energetic distribution of the emitted electrons reveals the interaction with the plasmonic field.
[1] Podbiel et al., Nano Letters 2017, 17(11): 6569-6574.
[2] Spektor et al., Science 2017, 355(6330): 1187-1191.