Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 50: Plasmonics & Nanooptics III: STM and Time-Resolved Methods (joint session O/CPP)
O 50.9: Vortrag
Mittwoch, 3. April 2019, 12:30–12:45, H8
Revealing local mode dynamics within a plasmonic nanoslit cavity by time-resolved photoemission electron microscopy — Bernhard Huber1, Daniel Friedrich2, Enno Krauss2, Sebastian Pres1, Philipp Grimm2, Daniel Fersch1, Julian Lüttig1, Victor Lisinetskii1, •Matthias Hensen1, Bert Hecht2, and Tobias Brixner1 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2NanoOptics & Biophotonics Group, Experimental Physics 5, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
Plasmonic cavities are known for supporting discrete modes upon resonant excitation with light. The associated characteristic pattern of intense electromagnetic hot-spots can be exploited to enhance light-matter interaction and to enable strong coupling of distinct cavities over a micrometer distance [1] or to strongly couple single excitons and plasmons at room temperature [2]. Here, we disentangle the local field dynamics of individual hot-spots within a nanoslit resonator with a spatial resolution of <10 nm by combining time-resolved photoemission electron microscopy (PEEM) and a 1 MHz NOPA system. Interestingly, we detect local differences of rather global properties such as the Q-factor and resonance frequency. By using the concept of quasinormal modes we explain these notable local differences, which will be experienced by, e.g., quantum emitters, with a non-negligible influence of adjacent resonator modes.
[1] M. Aeschlimann et al., Light Sci. Appl. 6, e17111 (2017)
[2] H. Groß et al., Sci. Adv. 4, eaar4906 (2018)