Abstract: The small wavelength of X-rays offer the opportunity to image with very high resolution. This property combined with the high-penetration of photons, with energies on the order of multiple keV, 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 briefly introduce the technique and highlight its applications for X-ray nanotomography.
Biography: Manuel Guizar-Sicairos 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 beamline 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. His research focuses on the development, advancement, and application of coherent X-ray imaging techniques, in particular on innovations in novel imaging methods and image reconstruction algorithms. Manuel received the 2019 ICO prize and is a Fellow Member of the OSA. 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.
Read More