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Near-field electron ptychography using full-field structured illumination.

Hirokazu Tamaki^1,2, Koh Saitoh³

¹Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan.

Microscopy (Oxford, England)

|July 25, 2024

Summary

A novel near-field ptychography technique uses full-field structured electron beams for enhanced imaging. This method improves reconstruction accuracy and efficiency, especially for large fields of view.

Keywords:

in-line holography phase measurement ptychography structured illumination wavefield reconstruction

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Area of Science:

Electron microscopy
Coherent diffractive imaging

Background:

Conventional ptychography often suffers from error accumulation.
Far-field observation can limit detector dynamic range.

Purpose of the Study:

To introduce a new near-field ptychography configuration for improved imaging.
To enhance reconstruction accuracy and efficiency.

Main Methods:

Utilizing full-field illumination with a structured electron beam.
Collecting in-line holograms in the near-field region.
Employing a stable, coherent beam generated by a conductive film.

Main Results:

Reconstruction error below 1/3485 of the wavelength for simulated data.
Accurate phase transmission function reconstruction for MgO particles.
Mean inner potential of 13.53±0.16 V for MgO, matching literature values.

Conclusions:

The proposed near-field ptychography method offers robust and efficient reconstruction.
Full-field illumination and near-field observation enhance imaging fidelity.
Validated by simulation and experimental results, it shows significant potential for advanced electron microscopy.