Results 111 to 120 of about 3,149 (205)

Iterative Joint Ptychography-Tomography with Total Variation Regularization [PDF]

, 2019
In order to determine the 3D structure of a thick sample, researchers have recently combined ptychography (for high resolution) and tomography (for 3D imaging) in a single experiment.
Stefano Marchesini, Huibin Chang, Pablo Enfedaque, Chang, Huibin, Marchesini, Stefano, Enfedaque, Pablo   +5 more
core   +1 more source

Multiplexing information limits in multi-beam ptychography

1292512938Ptychography is a lensless imaging technique where the sample is laterally scanned by the illuminating beam. In multi-beam ptychography multiple beams simultaneously illuminate the sample, enabling faster scanning of larger areas. In this work,
Penagos Molina, Daniel Santiago, Eschen, Wilhelm, Limpert, Jens, Rothhardt, Jan, Penagos Molina, Daniel S., Liu, Chang   +5 more
core   +1 more source

Image Recovery for Blind Polychromatic Ptychography

, 2022
Ptychography is a lensless imaging technique, which considers reconstruction from a set of far-field diffraction patterns obtained by illuminating small overlapping regions of the specimen.
Filbir, Frank, Melnyk, Oleh
core  

Near-field ptychography using lateral and longitudinal shifts

New Journal of Physics, 2015
Image reconstruction of in-line holography depends crucially on the probing wave front used to illuminate an object. Aberrations inherent to the illumination can mix with the features imposed by the object.
A-L Robisch, K Kröger, A Rack, T Salditt   +3 more
doaj   +1 more source

Measuring laser beam quality, wavefronts, and lens aberrations using ptychography

, 2020
We report on an approach for quantitative characterization of laser beam quality, wavefronts, and lens aberrations using ptychography with a near-infrared supercontinuum laser.
Loetgering, Lars, Du, Mengqi, Eikema, Kjeld S.E., Witte, Stefan   +3 more
core   +1 more source

Simulation Study of Low-Dose 4D-STEM Phase Contrast Techniques at the Nanoscale in SEM

Nanomaterials
Phase contrast imaging is well-suited for studying weakly scattering samples. Its strength lies in its ability to measure how the phase of the electron beam is affected by the sample, even when other imaging techniques yield low contrast.
Zvonimír Jílek, Tomáš Radlička, Vladislav Krzyžánek   +2 more
doaj   +1 more source

Multi-camera Fourier ptychography

, 2019
We demonstrate aperture-synthetic diffracted field measurement using multiple mutually incoherent cameras in Fourier ptychography to provide a scaleable increase in data acquisition bandwidth.
Tomas Aidukas (6914375), Imaging Concepts Group (6905342)   +1 more
core   +1 more source

Sampling in x-ray ptychography

, 2013
Coherent diffractive imaging (CDI) is a means of overcoming the resolution and image contrast limitations of electron and x-ray lenses. The central tenet of the method is that the intensity of the diffraction pattern must be measured on a sufficiently ...
Waigh, T. A., Edo, T. B., Maiden, A. M., Wagner, U., Batey, D. J., Pešić, Z. D., Rodenburg, J. M., Rau, C.   +7 more
core   +1 more source

Near-field Multi-slice Ptychography [PDF]

Ptychography is a form of computational microscopy that has risen to prominence in the past 20 years. Despite achieving record breaking resolution, Depth-of-Field (DoF) is a significant limiting factor for the technique.
Hu, Ziyang
core  

A distributed software system for integrating data-intensive imaging methods in a hard X-ray nanoprobe beamline at the SSRF

Journal of Synchrotron Radiation
The development of hard X-ray nanoprobe techniques has given rise to a number of experimental methods, like nano-XAS, nano-XRD, nano-XRF, ptychography and tomography. Each method has its own unique data processing algorithms.
Peicheng Zhang, Zhisen Jiang, Yan He, Aiguo Li   +3 more
doaj   +1 more source