52 citations · 211 across the 16 of their papers we have counts for
17 papers
Real-time imaging of acoustic waves in bulk materials with X-ray microscopy
Theodor S. Holstad, Leora E. Dresselhaus-Marais, Trygve Magnus Ræder +10
Materials modelling and processing require experiments to visualize and quantify how external excitations drive the evolution of deep subsurface structure and defects that determin…
Polychromatic neutron phase contrast imaging of weakly absorbing samples enabled by phase retrieval
Maja Østergaard, Estrid Buhl Naver, Anders Kaestner +8
We demonstrate the use of a phase retrieval technique for propagation-based phase contrast neutron imaging with a polychromatic beam. This enables imaging samples with low absorpti…
Simultaneous Bright- and Dark-Field X-ray Microscopy at X-ray Free Electron Lasers
Leora E. Dresselhaus-Marais, Bernard Kozioziemski, Theodor S. Holstad +40
The structures, strain fields, and defect distributions in solid materials underlie the mechanical and physical properties across numerous applications. Many modern microstructural…
Extensive 3D Mapping of Dislocation Structures in Bulk Aluminum
Can Yildirim, Henning F. Poulsen, Grethe Winther +3
Thermomechanical processing such as annealing is one of the main methods to tailor the mechanical properties of materials, however, much is unknown about the reorganization of disl…
X-ray Free Electron Laser based Dark-Field X-ray Microscopy
Theodor Secanell Holstad, Trygve Magnus Raeder, Mads Allerup Carlsen +6
Dark-field X-ray microscopy (DFXM) is a nondestructive full-field imaging technique providing three dimensional mapping of microstructure and local strain fields in deeply embedded…
Non-destructive determination of phase, size, and strain of individual grains in polycrystalline photovoltaic materials
Mariana Mar Lucas, Tiago Ramos, Peter S. Jørgensen +5
We demonstrate a non-destructive approach to provide structural properties on the grain level for the absorber layer of kesterite solar cells. Kesterite solar cells are notoriously…
In-Situ Visualization of Long-Range Defect Interactions at the Edge of Melting
Leora E. Dresselhaus-Marais, Grethe Winther, Marylesa Howard +9
Connecting a bulk material's microscopic defects to its macroscopic properties is an age-old problem in materials science. Long-range interactions between dislocations (line defect…
Geometrical Optics Formalism to Model Contrast in Dark-Field X-ray Microscopy
H. F. Poulsen, L. E. Dresselhaus-Marais, M. A. Carlsen +2
Dark-field X-ray microscopy is a new full-field imaging technique that nondestructively maps the structure and local strain inside deeply embedded crystalline elements in three dim…
Revisiting neutron propagation-based phase contrast imaging and tomography: use of phase retrieval to amplify the effective degree of brilliance
David M. Paganin, Morten Sales, Peter M. Kadletz +4
Propagation-based neutron phase-contrast tomography was demonstrated using the ISIS pulsed spallation source. The proof-of-concept tomogram with Paganin-type phase-retrieval filter…
X-ray coherent diffraction imaging with an objective lens: towards 3D mapping of thick polycrystals
Anders Filsøe Pedersen, Virginie Chamard, Carsten Detlefs +3
We report on a new x-ray imaging method, which combines the high spatial resolution of coherent diffraction imaging with the ability of dark field microscopy to map grains within t…
Imbibition in plant seeds
Jean-François Louf, Yi Zheng, Aradhana Kumar +5
We describe imbibition in real and artificial plant seeds, using a combination of experiments and theory. In both systems, our experiments demonstrate that liquid permeates the sub…
Extended formalism for simulating compound refractive lens-based x-ray microscopes
Hugh Simons, Sonja Rosenlund Ahl, Henning Friis Poulsen +1
We present a comprehensive formalism for the simulation and optimisation of CRLs in both condensing and full-field imaging configurations. The approach extends ray transfer matrix…
Full-field hard x-ray microscopy with interdigitated silicon lenses
Hugh Simons, Frederik Stöhr, Jonas Michael-Lindhard +4
Full-field x-ray microscopy using x-ray objectives has become a mainstay of the biological and materials sciences. However, the inefficiency of existing objectives at x-ray energie…
Noise Robustness of a Combined Phase Retrieval and Reconstruction Method for Phase-Contrast Tomography
Rasmus Dalgas Kongskov, Jakob Sauer Jørgensen, Henning Friis Poulsen +1
Classical reconstruction methods for phase-contrast tomography consist of two stages: phase retrieval and tomographic reconstruction. A novel algebraic method combining the two was…
Generalized balanced power diagrams for 3D representations of polycrystals
Andreas Alpers, Andreas Brieden, Peter Gritzmann +2
Characterizing the grain structure of polycrystalline material is an important task in material science. The present paper introduces the concept of generalized balanced power diag…
Oxygen Ordering Superstructures and Structural Phase Diagram of YBa_2Cu_3O_{6+x} Studied by Hard X-ray Diffraction
M. v. Zimmermann, T. Frello, N. H. Andersen +10
High energy x-ray diffraction is used to investigate the bulk oxygen ordering properties of YBa_2Cu_3O_{6+x}. Superstructures of Cu-O chains aligned along the b axis and ordered wi…
The Atomic and Electronic Structure of Liquid N- Methylformamide as Determined from Diffraction Experiments
J. Neuefeind, M. D. Zeidler, H. F. Poulsen
The structure of liquid N-methylformamide (NMF) has been investigated using synchrotron radiation at 77 and 95 keV. The use of high energy photons has several advantages, in this c…