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10 March 2020 Investigating ultrafast system dynamics at the nanoscale by photoemission electron microscopy (Conference Presentation)
Matthias Hensen
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Proceedings Volume 11278, Ultrafast Phenomena and Nanophotonics XXIV; 1127811 (2020) https://doi.org/10.1117/12.2545610
Event: SPIE OPTO, 2020, San Francisco, California, United States
Abstract
To disentangle the ultrafast dynamics of individual system constituents at the nanoscale we combine photoemission electron microscopy, providing a resolution of ~3 nm, and a 1 MHz NOPA (20 fs pulse duration, tunable from 215 to 970 nm). Specifically, I will focus on a two-pulse experiment in which we detect subtle differences in the local field evolution of individual hot-spots within a plasmonic nanoslit resonator. By using the concept of quasinormal modes we explain these local differences by crosstalk of adjacent resonator modes.[1] Moreover, I will present first results about selecting specific excitation pathways, described by double-sided Feynman diagrams, within single systems using phase-cycled three-pulse sequences, which are provided by a home-built LCD pulse shaper. We aim at adding nanoscale resolution to the well-established method of coherent multidimensional spectroscopy. [1] M. Hensen et al., Nano Lett. 19, 4651-4658 (2019)
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Matthias Hensen "Investigating ultrafast system dynamics at the nanoscale by photoemission electron microscopy (Conference Presentation)", Proc. SPIE 11278, Ultrafast Phenomena and Nanophotonics XXIV, 1127811 (10 March 2020); https://doi.org/10.1117/12.2545610
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KEYWORDS
Electron microscopy
Ultrafast phenomena
Plasmonics
Resonators
Diffraction
Excitons
LCDs
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