Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 61: Plasmonics and Nanooptics 2
O 61.3: Vortrag
Donnerstag, 8. September 2022, 11:15–11:30, H2
Probing a plasmon-polariton quantum wave packet — Sebastian Pres1, Bernhard Huber1, Daniel Fersch1, Enno Schatz2, Daniel Friedrich2, Victor Lisinetskii1, Ruben Pompe3, •Matthias Hensen1, Bert Hecht2, Walter Pfeiffer3, and Tobias Brixner1 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2NanoOptics & Biophotonics Group, Experimental Physics 5, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 3Fakultät für Physik, Universität Bielefeld, Universitätsstr. 25, 33615 Bielefeld, Germany
Beyond the classical picture, plasmon-polariton modes are treated as quasi-particles in quantum physics and they are considered essential for the realization of future nanoscale quantum functionality. Implementing and demonstrating such functionality requires local access to the quasi-particle’s quantum state to monitor its corresponding quantum wave-packet dynamics. Here, we report the local probing of such an eigenstate superposition, linked to a nanoslit resonator, using plasmon-polariton-assisted electron emission as signal in coherent two-dimensional nanoscopy1. We observe a quantum coherence oscillating at the third harmonic of the plasmon-polariton frequency and identify it, using quantum dynamical simulations, to arise from the superposition of energetically non-adjacent plasmon-polariton occupation number states. The simulations also contain an improved model for plasmon-polariton-assisted electron emission processes.
[1] M. Aeschlimann et al., Science 333,
1723-1726 (2011)