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- W2887456340 abstract "Atomic resolution imaging of light elements in electron-transparent materials has long been a challenge. Biomolecular materials, for example, are rapidly altered by incident electrons. We demonstrate a scanning transmission electron microscopy (STEM) technique, called STEM holography, capable of efficient structural analysis of beam-sensitive nanomaterials. STEM holography measures the absolute phase and amplitude of electrons passed through a specimen via interference with a vacuum reference wave. We use an amplitude-dividing nanofabricated grating to prepare multiple beams focused at the sample. We configure the postspecimen microscope imaging system to overlap the beams, forming an interference pattern. We record and analyze the pattern at each 2D-raster-scan-position, reconstructing the complex object wave. As a demonstration, we image gold nanoparticles on an amorphous carbon substrate at 2.4 Å resolution. STEM holography offers higher contrast of the carbon while maintaining gold atomic lattice resolution compared to high angle annular dark field STEM." @default.
- W2887456340 created "2018-08-22" @default.
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- W2887456340 date "2018-09-28" @default.
- W2887456340 modified "2023-09-25" @default.
- W2887456340 title "Probing Light Atoms at Subnanometer Resolution: Realization of Scanning Transmission Electron Microscope Holography" @default.
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- W2887456340 doi "https://doi.org/10.1021/acs.nanolett.8b03166" @default.
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