Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Poster Wednesday: Plasmonics and Nanooptics 2

O 59.7: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P4

Inelastic electron-photon scattering with broadband optical pulses — •Niklas Müller, Rasmus Lampe, Gerrit Vosse, Christopher Rathje, and Sascha Schäfer — Institute of Physics, University of Oldenburg, 26129 Oldenburg, Germany

The inelastic scattering of fast electrons at spatially confined light fields has recently enabled new techniques in ultrafast transmission electron microscopy (UTEM) [1,2,3] but is typically performed with narrow bandwidth light pulses. Here, we study the interaction of fast electrons with broadband, strongly chirped light fields. Optical pulses are generated in a home-build noncollinear optical parametric amplifier (NOPA) [4] with a spectral width of up to 200 nm in the visible range. Light reflection at an aluminum coated silicon nitride membrane leads to an intense multicolor near-field at which we inelastically scatter femtosecond electron pulses forming photon sidebands in the electron energy spectrum. The spectral sideband position changes with the relative timing between electron and light pulse according to the instantaneous frequency of the driving laser field. Different parameter regimes of electron and light chirp and their impact on inelastic scattering patterns are discussed.

[1] G. De Abajo and M. Kociak, New J. Phys. 10, 073035 (2008) [2] Barwick et al., Nature 462, 902-906 (2009) [3] Feist et al., Nature 521, 200-203 (2015) [4] G. Cerullo and S. De Silvestri, Rev. Sci. Instrum. 74, 1 (2003)