Phase retrieval framework for direct reconstruction of the projected refractive index applied to ptychography and holography

F Wittwer, J Hagemann, D Brückner, S Flenner… - Optica, 2022 - opg.optica.org
The interaction of an object with a coherent probe often encodes its properties in a complex-
valued function, which is then detected in an intensity-only measurement. Phase retrieval …

Oxygen-diffusion-driven oxidation behavior and tracking areas visualized by X-ray spectro-ptychography with unsupervised learning

M Hirose, N Ishiguro, K Shimomura… - Communications …, 2019 - nature.com
Oxygen storage and release with oxygen diffusion in the bulk of the cerium–zirconium solid
solution oxide Ce2Zr2O x (x= 7–8), which possesses an atomically ordered arrangement of …

Full-field quantitative X-ray phase nanotomography via space-domain Kramers–Kronig relations

KR Lee, J Lim, YK Park - Optica, 2023 - opg.optica.org
Given the low absorption contrast of X-rays, phase shift has been playing an important role
as an alternative source of contrast in X-ray nanoimaging. Numerous phase-measuring …

Quantitative, in situ visualization of intracellular insulin vesicles in pancreatic beta cells

A Guo, J Zhang, B He, A Li, T Sun… - Proceedings of the …, 2022 - National Acad Sciences
Characterizing relationships between Zn2+, insulin, and insulin vesicles is of vital
importance to the study of pancreatic beta cells. However, the precise content of Zn2+ and …

Visualization of Heterogeneous Oxygen Storage Behavior in Platinum‐Supported Cerium‐Zirconium Oxide Three‐Way Catalyst Particles by Hard X‐ray Spectro …

M Hirose, N Ishiguro, K Shimomura… - Angewandte Chemie …, 2018 - Wiley Online Library
The cerium density and valence in micrometer‐size platinum‐supported cerium–zirconium
oxide Pt/Ce2Zr2Ox (x= 7–8) three‐way catalyst particles were successfully mapped by hard …

Visualization of structural heterogeneities in particles of lithium nickel manganese oxide cathode materials by ptychographic X-ray absorption fine structure

H Uematsu, N Ishiguro, M Abe… - The Journal of …, 2021 - ACS Publications
A heterogeneous phase/structure distribution in the bulk of spinel lithium nickel manganese
oxides (LNMOs) is the key to maximizing the performance and stability of the cathode …

Nanoscale domain imaging of Li-rich disordered rocksalt-type cathode materials with X-ray spectroscopic ptychography

H Uematsu, N Ishiguro, M Abe, S Takazawa… - Physical Chemistry …, 2023 - pubs.rsc.org
Lithium-rich disordered rocksalt-type cathode materials are promising for high-capacity and
high-power lithium-ion batteries. Many of them are synthesized by mechanical milling and …

Partially coherent ptychography by gradient decomposition of the probe

H Chang, P Enfedaque, Y Lou… - … Section A: Foundations …, 2018 - journals.iucr.org
Coherent ptychographic imaging experiments often discard the majority of the flux from a
light source to define the coherence of the illumination. Even when the coherent flux is …

Phase retrieval based on a total-variation-regularized Poisson model for X-ray ptychographic imaging of low-contrast objects

K Yatabe, Y Takayama - Journal of Applied Crystallography, 2022 - journals.iucr.org
Hard X-ray ptychography has become an indispensable tool for observing the microscopic
structure of a thick specimen. It measures diffraction patterns by scanning an X-ray beam …

Method for restoration of X-ray absorption fine structure in sparse spectroscopic ptychography

N Ishiguro, Y Takahashi - Journal of Applied Crystallography, 2022 - journals.iucr.org
The spectroscopic ptychography method, a technique combining X-ray ptychography
imaging and X-ray absorption spectroscopy, is one of the most promising and powerful tools …