A5016340919- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Electron Microscopy Techniques and Applications
- Crystallography and Radiation Phenomena
- Particle Accelerators and Free-Electron Lasers
- Advancements in Photolithography Techniques
- Laser-Plasma Interactions and Diagnostics
- Advanced Surface Polishing Techniques
- Diamond and Carbon-based Materials Research
- X-ray Diffraction in Crystallography
- Electron and X-Ray Spectroscopy Techniques
- Iron oxide chemistry and applications
- High-pressure geophysics and materials
- Advanced X-ray and CT Imaging
- Photonic Crystals and Applications
- Nuclear Physics and Applications
- Enzyme Structure and Function
- Microstructure and Mechanical Properties of Steels
- Microstructure and mechanical properties
- Astrophysical Phenomena and Observations
- Laser Material Processing Techniques
- Medical Imaging Techniques and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Digital Holography and Microscopy
- Magnetic properties of thin films
European Synchrotron Radiation Facility
2015-2024
European Science Foundation
2005-2016
Immanuel Kant Baltic Federal University
2015
Institute of Problems of Chemical Physics
2012
Kurchatov Institute
1998-2011
Institute of Microelectronics Technology and High Purity Materials
1993-2011
Polygon Physics (France)
2006
CSIRO Manufacturing
2002
University of Stirling
2000
RWTH Aachen University
1998
Coherent properties of the x-ray beam delivered at ESRF allow observation very weak perturbations wave front, resulting in phase contrast. A straightforward experimental setup for contrast imaging is proposed and used to record holographic images from organic samples 10–100 μm energy 10–50 keV with up 50%–100%. The theory considered some theoretical estimations are made reveal performance technique terms resolution, sensitivity, geometrical requirements, range applicability. It found that...
Abstract Many physical and mechanical properties of crystalline materials depend strongly on their internal structure, which is typically organized into grains domains several length scales. Here we present dark-field X-ray microscopy; a non-destructive microscopy technique for the three-dimensional mapping orientations stresses lengths scales from 100 nm to 1 mm within embedded sampling volumes. The technique, allows ‘zooming’ in out both direct angular space, demonstrated by an annealing...
Terapascal static pressure generation is enabled in laboratory due to implementation of nanocrystralline diamond microballs.
The manufacture and properties of compound refractive lenses (CRLs) for hard X-rays with parabolic profile are described. These novel can be used up to ∼60 keV. A typical focal length is 1 m. They have a geometrical aperture mm best adapted undulator beams at synchrotron radiation sources. transmission ranges from few % in aluminium CRLs about 30% expected beryllium CRLs. gain (ratio the intensity spot relative behind pinhole equal size) larger than 100 1000 Due their they free spherical...
We describe refractive x-ray lenses with a parabolic profile that are genuine imaging devices, similar to glass for visible light. They open considerable possibilities in microscopy, tomography, microanalysis, and coherent scattering. Based on these microscope hard x rays is described, can operate the range from 2 50 keV, allowing magnifications up 50. At present, it possible image an area of about 300 μm diameter resolving power 0.3 be increased 0.1 μm. This especially suited opaque...
This paper describes a tunable X-ray focusing apparatus, referred to as transfocator, based on compound refractive lenses. By varying the number of lenses in beam, energy focused and focal length can be varied continuously throughout large range energies distances. The instrument used both white monochromatic beams focus, pre-focus or collimate beam. transfocator with other monochromators and/or elements, leading significant increases flux. Furthermore, chromatic nature means suppresses...
The vertical deposition technique for creating crystalline microstructures is applied the first time to nonspherical colloids in form of hollow silica cubes. Controlled cubes results large films with variable symmetry. are characterized detail scanning electron microscopy and small-angle X-ray scattering. In single layers cubes, distorted square hexagonal ordered arrays formed. For multilayered crystals, intralayer ordering predominantly a site stacking, similar that face centered cubic...
Parabolic refractive x-ray lenses with short focal distance can generate intensive hard microbeams lateral extensions in the 100 nm range even at a from synchrotron radiation source. We have fabricated planar parabolic made of silicon that few millimeters energies. In crossed geometry, two were used to microbeam size 380 by 210 25 keV 42 m Using diamond as lens material, down 20 and below are conceivable energy 10 keV.
Compound lenses made from low-Z materials (e.g., Be, B, C, and Al) set up as a linear array of refractive are proposed for submicrometer focusing high-energy x rays (>5 keV) in one or two dimensions. A theory based on Maxwell's equation the Fresnel-Kirchhoff approach is presented. were manufactured by drilling into an Al block 200 closely spaced holes 0.5 mm diameter crossed arrays 100 each point focusing. Focal spots 3.7 mum 8 18 obtained at 30 keV two-dimensional lenses, respectively....
Multiple refractive lenses with a focal length of 1 to 2 m are new tool for focusing hard x rays spot size in the micrometer range. They may be used microdiffraction, microfluorescence, and coherent imaging. The one or two dimensions. In this article, we have calculated transmission gain linear lens arrays, crossed arrays doubly parabolic profile. It is essential minimize mass absorption coefficient μ/ρ by choosing low Z materials order optimize transmission. can as high 5000 more, i.e.,...
Silicon refractive planar parabolic lenses with minimized absorption were fabricated by a combination of photolithography and dry-etching techniques. Focusing spectral properties the studied synchrotron radiation in energy range 8–25 keV at European Synchrotron Radiation Facility. A focal spot 1.8 μm gain 18.5 transmission more then 80% was measured 15.6 keV. The characteristics analyzed taking into account material dispersion photon-energy attenuation hard x-ray range.
Cross-sectional information on low electron density materials can be obtained by probing a sample with 60 keV coherent synchrotron x-ray beam in an in-line holography setup. Such objects are practically transparent to high energy x rays and create phase shift of the wave front only. Images 100 μm diameter boron fiber were recorded extreme near field region, where contrast occurs only at interfaces between regions different decrements refractive index. Theoretical simulations good agreement...
Holography with high energy x-rays is now feasible due to the coherence properties of third generation synchrotron sources. Simple in-line holographic techniques can be used generate edge-enhanced images which for many samples interpreted without direct phase retrieval. The such sources and their exploitation phase-contrast microimaging are demonstrated. technique easily combined computed microtomography (CMT) data collection reconstruction strategies three-dimensional imaging. A...
Parabolic refractive x-ray lenses are novel optical components for the hard range from about 5 keV to 120 keV. They compact, robust, and easy align operate. can be used like glass visible light, main difference being that numerical aperture is much smaller than 1 (of order of 10−4–10−3). have been developed at Aachen University made beryllium, boron, aluminium silicon. Their applications in micro- nanofocusing, imaging by absorption phase contrast. In combination with tomography they allow...
The diamond anvil cell (DAC) technique combined with laser heating is one of the major methods for studying materials at high pressure and temperature conditions. In this work, we present a transferable double-sided setup DACs in situ determination. allows precise samples inside DAC pressures above 200 GPa could be synchrotron beamline equipment. It can applied to X-ray diffraction transmission microscopy experiments. setup, use high-magnification low working distance infinity corrected...
We propose a simple interferometric technique for hard x-ray spatial coherence characterization, recording Fresnel interference pattern produced by round fiber or slit. have derived analytical formulas that give direct relation between visibility of fringes and either the source size transverse length. The is well suited to third-generation synchrotron radiation sources was experimentally applied determine length at European Synchrotron Radiation Facility.
We report the results of quantitative phase-contrast imaging experiments using synchrotron radiation, in-line geometry and a non-interferometric phase retrieval technique. This method is fast, simple, robust, does not require sophisticated x-ray optical elements can potentially provide submicron spatial resolution over field view order centimetres. In present experiment approximately 0.8 m has been achieved in images polystyrene sphere 19.6 keV x-rays. demonstrate that appropriate processing...
Ultra-high-resolution small-angle X-ray scattering in various colloidal photonic crystals is reported. It demonstrated that an angular resolution of about two microradians readily achievable at a third-generation synchrotron source using compound refractive optics. The scheme allows fast acquisition two-dimensional diffraction data and can be realised sample–detector separations only few metres. As result, measurements with interplanar spacings larger than micrometre, as well determination...
We report a novel type of x-ray interferometer employing bilens system consisting two parallel compound refractive lenses, each which creates diffraction limited beam under coherent illumination. By closely overlapping such beams, an interference field with fringe spacing ranging from tens nanometers to micrometers is produced. In experiment performed 12 keV x rays, submicron fringes were observed by scanning and moiré imaging the test grid. The far pattern was used characterize coherence....
The structure of spontaneously formed crystals in the sediments colloidal hematite (α-Fe2O3) cubes is studied using microradian X-ray diffraction. possess a superball shape and permanent magnetic dipole moment, both influencing self-assembly behaviour inducing directionality different ways. To control inter-cube interactions, were dispersed solvents and/or coated with silica layer allowed to form under simultaneous effect gravitational field an applied field. diffraction revealed that...