报告题目：Big-data, multi-channel 4D STEM with Ptychography
Since the development of aberration correctors and electron optical components, scanning transmission electron microscopy (STEM) has become a widely used and powerful technique for materials science research. However, there are still remaining challenging in many areas, such as super-resolution, beam sensitive materials characterization and three-dimensional quantitative imaging. In this talk, we will show that among a number of emerged new techniques, electron ptychography is a great candidate for tackling these challenges due to its potential for super-resolution imaging, high-contrast light-element detecting, low-dose imaging, 3D optical sectioning and coupling to spectroscopic data acquisition based upon a large-scale dataset in 4D-STEM experiments enabled with a new generation of high speed and efficient direct electron detectors.
Professor Peng Wang received his Ph.D degree in Engineering from University of Liverpool, UK in 2006. He was a research associate at SuperSTEM Laboratory in UK from 2007 to 2008. From 2008 to 2012 he worked as a research fellow in electron microscopy group at Oxford University. He joined Nanjing University (NJU), China as a Professor in 2012 and setup Nanjing Sub-atomic Resolution EM Laboratory in NJU. Prof. Wang's research interests have been in the applications of aberration corrected scanning transmission electron microscopy (STEM) imaging and electron energy loss spectroscopy to characterize materials at nano and atomic scales from two to three dimensions. He had developed a technique of 3D imaging materials at the nano-scale using scanning confocal electron microscopy (SCEM) performed on a double aberration-corrected TEM. Currently he is focusing on developing an advanced coherent diffractive imaging technique, so called Ptychography. In last 5 years, he has published 61 peer-reviewed papers in journals, which contains 21 first or corresponding authored papers including Nature, Nature Electronics, Nature Communications and Physical Review Letters. He is a member of Institute of Physics (MInstP), Youth Committee of Chinese Materials Research Society (CMRS), Committee of Chinese Electron Microscopy Society and Committee of Chinese Crystallography Society.