STROBE Seminar: David Ren, "3D Phase Contrast Tomography with Atomic Resolution"

Event Date: 

Monday, March 18, 2019 - 1:00pm

Speaker Name(s): 

David Ren, Graduate Student in Waller Group

Speaker Affiliation(s): 

UC Berkeley

Event Details: 

Electron tomography is a technique used in both materials science and structural biology to image features well below optical resolution limit. In this work, we present a new algorithm for reconstructing the three-dimensional(3D) electrostatic potential of a sample at atomic resolution from phase contrast imaging using high-resolution transmission electron microscopy. Our method accounts for dynamical and strong phase scattering, providing more accurate results with much lower electron doses than those current atomic electron tomography experiments. Our simulation results show that, for a wide range of experimental parameters, we can accurately determine both atomic positions and species, and also identify vacancies even for light elements such as silicon and disordered materials such as amorphous silicon dioxide and also identify vacancies. Our preliminary experimental results also show promising outcome of the method.