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Integrated Differential Phase Contrast (IDPC)-STEM Utilizing a Multi-Sector Detector for Imaging Tick Samples by Z Li, J Biskupek, U Kaiser, and H Rose, Microsc Microanal |
https://doi.org/10.1017/S1431927622000289. Te IDPC method is useful for generating a map of a thin
sample. We evaluate the potential of IDPC imaging for thick samples from focal-series calculations. We found that the anisotropy of the contrast transfer function (CTF) is enhanced at higher defoci when applying a standard quadrant detector, which is not the case when using a multi-sector detector for IDPC imaging. Sector-number-dependent calculations for both Cc
/C3 -corrected and C3 -corrected STEM show that increasing
the number of detector sectors results in an almost isotropic contrast transfer and also enhances the image contrast and resolution. We suggest that the enhanced contrast at low spatial frequencies will be extremely helpful for imaging biological samples effectively without applying a large defoci or using a phase plate. For a proof-of-principle IDPC-STEM (uncorrected) experiment, we realize the functionality of a 12-sector detector from a physical quadrant detector and demonstrate the improvement in contrast and resolution on a InGaN/GaN quantum well structure (Figure).
Experimental IDPC-STEM images of InGaN/GaN quantum wells on 1 μm thick GaN prepared in cross section. Images were obtained at an accelerating voltage of 200 kV and the probe focused at a sample slice 20 nm from the top. The IDPC mode employs a) the fixed quadrant detector, and b) a virtual 12-sector detector generated from the fixed quadrant detector.
A top journal in Microscopy
Published for the Microscopy Society of America Editor: John Mansfield, University of Michigan, USA
The only journal owned by scientists and published for scientists, Microscopy and Microanalysis provides original research papers in the fields of microscopy, imaging and compositional analysis. This distinguished international forum is intended for microscopists in both biology and materials science.
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cambridge.org/mam Microscopy Society of America 2022 July •
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