May 15 – 20, 2022
Hotel Hermitage, La Biodola Bay, Elba Island, Italy
Europe/Rome timezone

Spectroscopic micro-imaging with off-axis zone plates

May 19, 2022, 4:20 PM
20m
Hotel Hermitage, La Biodola Bay, Elba Island, Italy

Hotel Hermitage, La Biodola Bay, Elba Island, Italy

Biodola Bay 57037 Portoferraio (LI) Isola d’Elba - Italy
Oral

Speaker

Jan Oliver Schunck (Deutsches Elektronen-Synchrotron DESY)

Description

Soft X-ray spectroscopies usually average the observed response of a sample across the entire illuminated area. This restricts the obtainable information, especially if the sample is inhomogeneous (either because of electronic domain formation or patterning on the micro- and nanoscale). Formation of electronically distinct domains has been observed for various quantum materials. A complete understanding thus necessitates a domain-resolved experimental approach.
We demonstrate the implementation of an experimental setup, build around an off-axis Fresnel zone plate, which enables imaging X-ray absorption spectroscopy and resonant inelastic X-ray scattering with a current spatial resolution down to 1.8µm. The zone plate, located between sample and detector, disperses X-rays scattered from the sample and also images the sample along the direction perpendicular to the dispersion. Incident X-rays are focused to a 1mm long line such that excitation spectra from each point along the line are measured in-parallel.
In a microstructured VO2 thin-film, we find that the structure edges undergo the insulator-metal transition earlier than the centers, hinting at facilitated strain release. We believe that the observed effects apply in general to patterned films of quantum materials and provide a tool for adequate experimental studies.
Reference: J.O. Schunck et al. Optica 8(2), 2021

Primary author

Jan Oliver Schunck (Deutsches Elektronen-Synchrotron DESY)

Co-authors

Dr Florian Döring (Paul Scherrer Institut, Villigen PSI, Switzerland) Dr Benedikt Rösner (Paul Scherrer Institut, Villigen PSI, Switzerland) Dr Jens Buck (Institut für Experimentelle und Angewandte Physik, Kiel University, Kiel, Germany) Mr Robin Engel (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) Dr Piter Miedema (Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) Dr Sanjoy Kr Mahatha (Ruprecht Haensel Laboratory, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany) Moritz Hoesch (DESY Photon Science) Dr Adrian Petraru (Nanoelektronik, Technische Fakultät, Kiel University, Kiel, Germany) Prof. Hermann Kohlstedt (Nanoelektronik, Technische Fakultät, Kiel University, Kiel, Germany) Dr Christian Schüßler-Langeheine (Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany) Kai Rossnagel (DESY / CAU Kiel) Christian David Martin Beye (DESY)

Presentation materials