X-ray coherent lensless imaging and ptychography at Synchrotron sources
Dr. Manuel Guizar- Sicairos
Paul Scherrer Institut
Virtual (link below)
Faculty Host: Rolando Valdes-Aguilar
Abstract: X-rays have a wavelength ranging from a few nm to below 1 nm, therefore offer the opportunity to probe matter even down to atomic resolution. Combined with their very low absorption, they are ideal for nanoscale-resolution imaging in 3D, with important applications for energy functional materials as well as biology. However, manufacturing efficient high-resolution X-ray lenses is very challenging and a current bottleneck for resolution. If the X-ray source is sufficiently coherent, as is the case for Synchrotron X-ray light sources, then imaging lenses can be forgone altogether and instead computational reconstructions can be used, for example via holography or iterative phase retrieval algorithms. Ptychography is a technique belonging to the latter group, where intensity far-field measurements are processed iteratively in order to retrieve the phase that is not measured by the detector, effectively recovering a high-resolution image of the sample. Ptychography is highly versatile, and can be used with different wavelengths and experimental geometries. In this talk I will introduce the technique, basic reconstruction algorithms, and highlight its applications for X-ray nanotomography.
Bio: Manuel Guizar-Sicairos (he/him) received his B.Sc. and M.Sc. from the Tecnológico de Monterrey, Mexico, and his Ph.D. from the University of Rochester in 2010. Currently, he is a senior scientist at the coherent small-angle X-ray scattering (cSAXS) beamline of the Swiss Light Source (SLS) and has coauthored over 100 peer-reviewed publications. Manuel is the 2019 ICO prize recipient and is a Fellow Member of Optica and the SPIE. He has contributed to novel approaches in X-ray coherent imaging including X-ray holography, to phase retrieval, ptychography, small-angle X-ray scattering, and tomography.
Please use the Zoom link below to attend virtually:
https://osu.zoom.us/j/94858307115?pwd=K0JDMTROWVhIOUp6bU1sU0prZjNUZz09
Meeting ID: 948 5830 7115
Password: PRB1080
