Journal Article

PUBDB-2023-07286

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Artifact-suppressing reconstruction of strongly interacting objects in X-ray near-field holography without a spatial support constraint

Dora, J. (Corresponding author)Extern*DESY* ; Möddel, M. ; Flenner, S.Extern*HZG*Hereon* ; Schroer, C.XFEL.EU*DESY* ; Knopp, T.Extern* ; Hagemann, J. (Last author)DESY*

2024
Optica Washington, DC

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Please use a persistent id in citations: doi:10.1364/OE.514641  doi:10.3204/PUBDB-2023-07286

Abstract: The phase problem is a well known ill-posed reconstruction problem of coherent lens-less microscopic imaging, where only the squared magnitude of a complex wavefront is measured by a detector while the phase information of the wave field is lost. To retrieve the lost information, common algorithms rely either on multiple data acquisitions under varying measurement conditions or on the application of strong constraints such as a spatial support. In X-ray near-field holography, however, these methods are rendered impractical in the setting of time sensitive in situ and operando measurements. In this paper, we will forego the spatial support constraint and propose a projected gradient descent (PGD) based reconstruction scheme in combination with proper preprocessing and regularization that significantly reduces artifacts for refractive reconstructions from only a single acquired hologram without a spatial support constraint. We demonstrate the feasibility and robustness of our approach on different data sets obtained at the nano imaging endstation of P05 at PETRA III (DESY, Hamburg) operated by Helmholtz-Zentrum Hereon.

Note: Helmholtz Association ZT-I-PF-4-027 (SmartPhase)

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Contributing Institute(s):

1. FS-PETRA (FS-PETRA)
2. FS-Photon Science (FS-PS)
3. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. HIDSS-0002 - DASHH: Data Science in Hamburg - Helmholtz Graduate School for the Structure of Matter (2019_IVF-HIDSS-0002) (2019_IVF-HIDSS-0002)
3. SFB 986 Z02 - Multiskalige Analyse von Strukturen und Prozessen mit Synchrotronstrahlung und Neutronen (Z02) (221133217) (221133217)
4. DFG project G:(GEPRIS)192346071 - SFB 986: Maßgeschneiderte Multiskalige Materialsysteme - M3 (192346071) (192346071)
5. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. PETRA Beamline P05 (PETRA III)

Appears in the scientific report 2024

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