Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Plasmonics and Nanooptics II: Ultrafast and Nonlinear Phenomena (joint session O/CPP)

O 18.2: Vortrag

Montag, 16. März 2020, 15:30–15:45, WIL A317

Time-resolved and spatially-resolved mode dynamics within a plasmonic nanoslit cavity investigated by coherent two-dimensional nanoscopySebastian Pres1, Daniel Friedrich2, Daniel Fersch1, Enno Krauss2, Bernhard Huber1, Victor Lisinetskii1, •Matthias Hensen1, Bert Hecht2, and Tobias Brixner11Institut 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

Recently, we revealed the impact of off-resonant eigenmodes on the local field dynamics of plasmonic hot-spots within a single nanoslit cavity with a spatial and temporal resolution of 10 nm and 20 fs, respectively, by combining photoemission electron microscopy and interferometric two-pulse sequences [1]. Here, we extend the excitation scheme of the nanoslit cavity to a three-pulse sequence using an LCD-based pulse shaper to perform two-dimensional spectroscopy with unprecedented spatial resolution [2]. Due to the nonlinearity of the photoelectron emission process higher-order signals are easily disclosed. These results are supported by quantum dynamical simulations in which the plasmonic nanoslit is modelled as a quantized harmonic oscillator instead of classical fields. Detecting such signal contributions will be helpful in future experiments to reveal the impact of many-body interactions in molecular or solid-state systems with nanometer resolution.
[1] M. Hensen et al., Nano Lett. 19, 4651 (2019)
[2] B. Huber et al., Rev. Sci. Intrum. 90, 113103 (2019)

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