Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 37: Magnetic Imaging Techniques
MA 37.6: Talk
Thursday, March 20, 2025, 16:15–16:30, H16
Fast spectroscopic imaging using extreme ultraviolet interferometry — •Hannah C. Strauch1, Fengling Zhang2, Stefan Mathias1, Thorsten Hohage3, Stefan Witte2,4, and G. S. Matthijs Jansen1 — 1University of Göttingen, 1st Institute of Physics, Göttingen, Germany — 2Advanced Research Center for Nanolithography, Amsterdam, The Netherlands — 3University of Göttingen, Institute of Numerical and Applied Mathematics, Göttingen, Germany — 4Imaging Physics department, TU Delft, The Netherlands
Extreme ultraviolet (EUV) pulses generated by high harmonic generation (HHG) offer element-specificity in spectroscopic applications [1], and an excellent platform for nanoscale coherent diffractive imaging. Thus, the combination of time-resolved spectroscopy and microscopy using HHG light is highly promising, but it is only hardly explored due to the challenge of extracting full spectroscopic and microscopic information from measurements of reasonable duration.
We will present FTSH, an interferometric solution that combines Fourier-transform spectroscopy (FTS) and holography [2], employing a pair of phase-locked EUV pulses. This combination explicitly encodes the EUV spectral information in the diffraction pattern. Compared to traditional FTS, FTSH dramatically reduces the interferometric sampling requirements. This enables full spectroscopic images in less than two minutes and makes our approach particularly promising for femtosecond time-resolved spectroscopic imaging.
[1] Möller et al., Commun. Phys. 7, 74 (2024)
[2] Strauch et al., Opt. Express 32(16), 28644-28654 (2024)
Keywords: Spectroscopic Imaging; EUV