Three-dimensional structure of buried heterointerfaces revealed by multislice ptychography

O’Leary, Colum M.; Sha, Haozhi; Zhang, Jianhua; Su, Cong; Kahn, Salman; Jiang, Huaidong; Zettl, Alex; Ciston, Jim; Miao, Jianwei

doi:10.1103/physrevapplied.22.014016

Phys. Rev. Applied

2024

DOI: 10.1103/physrevapplied.22.014016

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Three-dimensional structure of buried heterointerfaces revealed by multislice ptychography

Colum M. O’Leary,

Haozhi Sha,

Jianhua Zhang

et al.

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Cited by 2 publications

References 57 publications

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Ultra-fast Digital DPC Yielding High Spatio-temporal Resolution for Low-Dose Phase Characterization

Bekkevold,

Peters,

Ishikawa

et al. 2024

Microscopy and Microanalysis

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In the scanning transmission electron microscope, both phase imaging of beam-sensitive materials and characterization of a material’s functional properties using in situ experiments are becoming more widely available. As the practicable scan speed of 4D-STEM detectors improves, so too does the temporal resolution achievable for both differential phase contrast (DPC) and ptychography. However, the read-out burden of pixelated detectors, and the size of the gigabyte to terabyte sized data sets, remain a challenge for both temporal resolution and their practical adoption. In this work, we combine ultra-fast scan coils and detector signal digitization to show that a high-fidelity DPC phase reconstruction can be achieved from an annular segmented detector. Unlike conventional analog data phase reconstructions from digitized DPC-segment images yield reliable data, even at the fastest scan speeds. Finally, dose fractionation by fast scanning and multi-framing allows for postprocess binning of frame streams to balance signal-to-noise ratio and temporal resolution for low-dose phase imaging for in situ experiments.

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Ultra-fast Digital DPC Yielding High Spatio-temporal Resolution for Low-Dose Phase Characterization

Bekkevold,

Peters,

Ishikawa

et al. 2024

Microscopy and Microanalysis

View full text Add to dashboard Cite

show abstract

Improved Three-Dimensional Reconstructions in Electron Ptychography through Defocus Series Measurements

Schloz,

Pekin,

Brown

et al. 2024

Microscopy and Microanalysis

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A detailed analysis of ptychography for three-dimensional (3D) phase reconstructions of thick specimens is performed. We introduce multi-focus ptychography, which incorporates a 4D-STEM defocus series to enhance the quality of 3D reconstructions along the beam direction through a higher overdetermination ratio. This method is compared with established multi-slice ptychography techniques, such as conventional ptychography, regularized ptychography, and multi-mode ptychography. Additionally, we contrast multi-focus ptychography with an alternative method that uses virtual optical sectioning through a reconstructed scattering matrix (S-matrix), which offers more precise 3D structure information compared to conventional ptychography. Our findings from multiple 3D reconstructions based on simulated and experimental data demonstrate that multi-focus ptychography surpasses other techniques, particularly in accurately reconstructing the surfaces and interface regions of thick specimens.

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Three-dimensional structure of buried heterointerfaces revealed by multislice ptychography

Cited by 2 publications

References 57 publications

Ultra-fast Digital DPC Yielding High Spatio-temporal Resolution for Low-Dose Phase Characterization

Ultra-fast Digital DPC Yielding High Spatio-temporal Resolution for Low-Dose Phase Characterization

Improved Three-Dimensional Reconstructions in Electron Ptychography through Defocus Series Measurements

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