Results 81 to 90 of about 1,452 (172)
Strategies for Suppression and Compensation of Signal Loss in Ptychography
PhotonicsX-ray ptychography is an ultrahigh resolution imaging technique widely used in synchrotron radiation facilities. Its imaging performance relies on the quality of the acquired signals. However, the X-ray detectors used often suffer from signal loss due to
Ruoru Li +6 more
doaj +1 more source
Sparsely sampled Fourier ptychography
Optics Express, 2014 Fourier ptychography (FP) is an imaging technique that applies angular diversity functions for high-resolution complex image recovery. The FP recovery routine switches between two working domains: the spectral and spatial domains. In this paper, we investigate the spectral-spatial data redundancy requirement of the FP recovery process.
Siyuan, Dong +3 more
openaire +2 more sources
Solving ptychography with a convex relaxation
New Journal of Physics, 2015 8 pages, 8 ...
Horstmeyer, Roarke +5 more
openaire +6 more sources
Electron ptychography describes a family of algorithms which are used to enable the reconstruction of complex specimen transmission functions of a sample in order to obtain both phase and amplitude information, as applied within the realms of electron microscopy.
Wei Mao, Liqi Zhou, Si Gao, Peng Wang
openaire +3 more sources
Fresnel coherent diffractive imaging tomography of whole cells in capillaries
New Journal of Physics, 2014 X-ray tomography can be used to study the structure of whole cells in close to their native state. Ptychographic Fresnel coherent diffractive imaging (FCDI) holds particular promise for high-resolution tomographic imaging with quantitative phase ...
Mac B Luu +13 more
doaj +1 more source
Optimization of overlap uniformness for ptychography
Optics Express, 2014 We demonstrate the advantages of imaging with ptychography scans that follow a Fermat spiral trajectory. This scan pattern provides a more uniform coverage and a higher overlap ratio with the same number of scan points over the same area than the presently used mesh and concentric [13] patterns.
Huang, X +5 more
openaire +3 more sources
Enhanced Imaging in Scanning Transmission X-Ray Microscopy Assisted by Ptychography
NanomaterialsScanning transmission X-ray microscopy (STXM) is a direct imaging technique with nanoscale resolution. But its resolution is limited by the spot size on the sample, i.e., by the manufacturing technique of the focusing element.
Shuhan Wu +7 more
doaj +1 more source
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 +3 more
doaj +1 more source
Time-domain vector ptychography
Optics ExpressWe demonstrate the reconstruction of the instantaneous polarization state of ultrafast laser pulses through vectorial time-domain ptychography. We introduce the formalism, investigate the algorithm’s capacities through simulations, and finally validate it by reconstructing several polarization states from experiments.
T. Schweizer +3 more
openaire +2 more sources
Simulation Study of Low-Dose 4D-STEM Phase Contrast Techniques at the Nanoscale in SEM
NanomaterialsPhase 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 +2 more
doaj +1 more source