Efficient large field of view electron phase imaging using near-field electron ptychography with a diffuser
Frederick Allars, Peng‐Han Lu, Maximilian Kruth, Rafal E. Dunin–Borkowski, J. M. Rodenburg, Andrew Maiden
Abstract
Most implementations of ptychography on the electron microscope operate in scanning transmission (STEM) mode, where a small focussed probe beam is rapidly scanned across the sample. In this paper we introduce a different approach based on near-field ptychography, where the focussed beam is replaced by a wide-field, structured illumination, realised through a purpose-designed etched Silicon Nitride window. We show that fields of view as large as 100 μm2 can be imaged using the new approach, and that quantitative electron phase images can be reconstructed from as few as nine near-field diffraction pattern measurements.
Topics & Concepts
PtychographyOpticsScanning transmission electron microscopyDiffractionPhase retrievalDiffuser (optics)Phase (matter)ElectronMaterials scienceCathode rayPhysicsTransmission electron microscopyFourier transformLight sourceQuantum mechanicsAdvanced X-ray Imaging TechniquesAdvanced Electron Microscopy Techniques and ApplicationsParticle Accelerators and Free-Electron Lasers