Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 37: Magnetic Imaging Techniques
MA 37.5: Vortrag
Donnerstag, 20. März 2025, 16:00–16:15, H16
Transport of Intensity Phase Retrieval in the Presence of Intensity Variations and Unknown Boundary Conditions — •Oleksandr Zaiets1,2, Axel Lubk1,2, Radmilla Kyrychenko1, Daniel Wolf1, Maximilian Wegner1, Max Herzog1, Moritz Winter1,3,4, Praveen Vir3, Johannes Schultz1, Claudia Felser3, and Bernd Büchner1,2 — 1Leibniz Institute for Solid State and Materials Research Dresden, Dresden, Germany — 2Institute of Solid State and Materials Physics, TU Dresden, Dresden, Germany — 3Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 4Dresden Center for Nanoanalysis, cfaed, Technical University Dresden, Dresden, Germany
Transport of Intensity Equation (TIE) phase retrieval technique is widely applied in light, X-ray and electron optics to reconstruct, e.g., refractive indices, electric and magnetic fields in solids. The TIE method reconstructs the phase from two or three mutually slightly defocused microscopy images by solving an elliptic partial differential equation - the TIE. Here, we present a largely improved TIE reconstruction algorithm, which properly considers intensity variations as well as unknown boundary conditions in a finite difference implementation of the TIE. That largely removes reconstruction artifacts encountered in state-of-the-art Poisson solvers of the TIE, and hence significantly increases the applicability of the technique. We demonstrate the improved performance of the TIE reconstruction algorithm at a set of simulated and experimental image intensities arising from magnetic structures investigated in TEM.
Keywords: Phase retrieval; Transmission electron microscopy; Magnetic imaging