X-ray ptychography

Observations of artefacts in the x-ray ptychography method.

X-ray ptychography, a scanning coherent diffraction imaging method, was used to reconstruct images of a "Siemens star" test pattern with amplitude and phase contrast. While studying how the use of illumination with an increased bandwidth results in clear improvements in the quality of image reconstructions, we found that an artificial change in the overall distance scale factor of the algorithm...

High Resolution Hard X-ray Magnetic Imaging with Dichroic Ptychography

Claire Donnelly, 2 Valerio Scagnoli, 2, ∗ Manuel Guizar-Sicairos, Mirko Holler, Fabrice Wilhelm, Francois Guillou, Andrei Rogalev, Carsten Detlefs, Andreas Menzel, Jörg Raabe, and Laura J. Heyderman 2, † Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland Paul Scherrer Institute, 5232 Villigen PSI, Switzerland ESRF, 71 Avenue des Martyrs, 38000 Greno...

Molar concentration from sequential 2-D water-window X-ray ptychography and X-ray fluorescence in hydrated cells

Recent developments in biological X-ray microscopy have allowed structural information and elemental distribution to be simultaneously obtained by combining X-ray ptychography and X-ray fluorescence microscopy. Experimentally, these methods can be performed simultaneously; however, the optimal conditions for each measurement may not be compatible. Here, we combine two distinct measurements of u...

Imaging of highly inhomogeneous strain field in nanocrystals using x-ray Bragg ptychography: A numerical study

Framework for three-dimensional coherent diffraction imaging by focused beam x-ray Bragg ptychography.

We present the framework for convergent beam Bragg ptychography, and, using simulations, we demonstrate that nanocrystals can be ptychographically reconstructed from highly convergent x-ray Bragg diffraction. The ptychographic iterative engine is extended to three dimensions and shown to successfully reconstruct a simulated nanocrystal using overlapping raster scans with a defocused curved beam...