TODAY: Colloquium Tuesday, April 19 with Dr. Manuel Guizar- Sicairos, Paul Scherrer Institut

[Leonard, Ruth A.]

Please join us today - Tuesday, April 19th - for a Colloquium at 3:45 p.m. with Dr. Manuel Guizar- Sicairos, Paul Scherrer Institut

Faculty Host: Rolando Valdes-Aguilar

Please use the Zoom link below to attend virtually.


X-ray coherent lensless imaging and ptychography at Synchrotron sources



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.



Short 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.



Zoom link:

https://osu.zoom.us/j/94858307115?pwd=K0JDMTROWVhIOUp6bU1sU0prZjNUZz09

Meeting ID: 948 5830 7115

Password: PRB1080






[The Ohio State University]
Ruth Leonard
Executive Assistant to the Chair
Department of Physics
Physics Research Building, 191 West Woodruff Ave, Columbus, OH 43210
614-292-5018 Office
leonard.469 at osu.edu<mailto:leonard.469 at osu.edu>

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