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O: Fachverband Oberflächenphysik

O 19: Vacuum Science & Technology: Theory and Applications – Poster

O 19.6: Poster

Montag, 9. März 2026, 18:00–20:00, P2

Towards nanoscale EUV spectroscopy of 2D heterostructures using interferometric coherent diffractive imaging — •Hannah Strauch, Jan Mädrich, Daniel Steil, Stefan Mathias, and G. S. Matthijs Jansen — University of Göttingen, 1st Institute of Physics, Göttingen, Germany

Time-resolved spectroscopy in the extreme ultraviolet (EUV) energy range provides element-specific insight into electronic and structural dynamics. Particularly, EUV spectroscopy of nanoscale 2D material heterostructures enables to identify the individual layer contributions due to its element-specificity. For such systems, however, a spatially resolved probe is essential: 2D material heterostructures are both intrinsically micro-scale and highly susceptible to spatial inhomogeneities. The comprehensive understanding of ultrafast dynamics in those systems therefore requires simultaneous spatial, spectral, and temporal resolution, which is a combination that remains experimentally demanding even with state-of-the-art techniques.

We will present our progress towards such a comprehensive measurement approach with our table-top EUV interferometry-based setup, which enables time-resolved spectroscopy with spatial resolution through the combination of Fourier transform holography (FTH) with interferometric Fourier transform spectroscopy (FTS). The surface sensitivity required for few-layer systems is provided through measurements in reflection geometry.

Keywords: Fourier transform holography; Fourier transform spectroscopy; ultrafast optical spectroscopy