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O: Fachverband Oberflächenphysik
O 36: Poster: Ultrafast Electron Dynamics at Surfaces and Interfaces
O 36.23: Poster
Dienstag, 19. März 2024, 18:00–20:00, Poster C
EUV pump-probe spectroscopic imaging — •Hannah Strauch1, Fengling Zhang2, Bent van Wingerden1, Daniel Steil1, Stefan Witte2, Thorsten Hohage3, Stefan Mathias1, and G. S. Matthijs Jansen1 — 1University of Göttingen, I. Physical Institute, Göttingen, Germany — 2Advanced Research Center for Nanolithography, Amsterdam, The Netherlands — 3University of Göttingen, Institute of Numerical and Applied Mathematics, Göttingen, Germany
Extreme ultraviolet (EUV) spectroscopy accesses element-specific core levels, and thereby enables an element-resolved view of electronic, structural and magnetic dynamics. Likewise, EUV diffractive imaging allows nanoscale imaging of complex structures. The combination of both strengths in femtosecond spectromicroscopy is highly promising, but typically requires long measurement runs as well as a rigorous mathematical treatment of the data.
Here, we address these challenges by combining Fourier-transform spectroscopy and Fourier-transform holography (FTH) in a table-top interferometric high-harmonic generation experiment. From the far-field diffraction pattern of two phase-locked EUV pulses, we reconstruct spectromicroscopic images using an iteratively regularized Gauss-Newton algorithm. This approach implements prior knowledge of the spectral domain and thereby reduces the sampling requirements and measurement time by an order of magnitude. We will report on progress towards time-resolved spectroscopy of light-induced dynamics in exfoliated 2D material nanostructures based on spectroscopic FTH.
Keywords: EUV spectroscopic imaging; Fourier-transform spectroscopy; Fourier-transform holography