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Efficient linear phase contrast in scanning transmission electron microscopy with matched illumination and detector interferometry
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Efficient linear phase contrast in scanning transmission electron microscopy with matched illumination and detector interferometry
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Journal Article
Efficient linear phase contrast in scanning transmission electron microscopy with matched illumination and detector interferometry
2016
Overview
The ability to image light elements in soft matter at atomic resolution enables unprecedented insight into the structure and properties of molecular heterostructures and beam-sensitive nanomaterials. In this study, we introduce a scanning transmission electron microscopy technique combining a pre-specimen phase plate designed to produce a probe with structured phase with a high-speed direct electron detector to generate nearly linear contrast images with high efficiency. We demonstrate this method by using both experiment and simulation to simultaneously image the atomic-scale structure of weakly scattering amorphous carbon and strongly scattering gold nanoparticles. Our method demonstrates strong contrast for both materials, making it a promising candidate for structural determination of heterogeneous soft/hard matter samples even at low electron doses comparable to traditional phase-contrast transmission electron microscopy. Simulated images demonstrate the extension of this technique to the challenging problem of structural determination of biological material at the surface of inorganic crystals.
Scanning transmission electron microscopy is a powerful material probe, but constrained to large atomic number samples due to the issues of beam damage and weak scattering. Here, Ophus
et al.
propose a method that produces linear phase contrast in a focused electron beam to image dose-sensitive objects.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
