Quantitative Differential Phase Contrast (qDPC) with 4D STEM and Segmented Detector modules

The qDPC integrates DPC (Differential Phase Contrast) signals to obtain a phase contrast image. The qDPC gives a boundary-artifact-free solution using DCT (Discrete Cosine Transform) contrary to the solution given by FFT (Fast Fourier transform). The qDPC has also a real-time integration capability that is ideal for the segmented detector (Optional Segmented Detector module).

4D STEM module for qDPC
The 4D STEM module creates more quantitative DPC signals at each 2D diffraction pattern than those from the segment detector. Then, the calculated DPC signals can be processed by qDPC to give a quantitative phase distribution. There are two modules for Gatan STEMx and JEOL 4DCanvas, respectively.

Segment Detector (SD) module
The SD module captures the signals from the segmented detector using Gatan’s DigiScan II, and calculates a phase distribution in real time. Therefore, you can see the phase image and other STEM image(s), such as HAADF image, with the progress of the scan using the SD module.

References and Technical Notes (*Basic Readings)

• * A. Ishizuka and K. Ishizuka: Observation of Phase Objects using STEM – Differential Phase Contrast (DPC) Microscopy, JEOL News 55 (2020) 24-31.
• * Ishizuka A, Oka M, Seki T, Shibata N and Ishizuka K: Numerical Procedures to determine Potential Distribution from Electronic Field Vectors observed in Differential Phase Contrast (DPC) imaging, M&M 2017.
• * Ishizuka A, Oka M, Seki T, Shibata N and Ishizuka K: Boundary-artifact-free determination of potential distribution from differential phase contrast signals, Microscopy 66, 397 (2017).
• Shibata N, Findlay SD, Kohno Y, Sawada H, Kondo Y & Ikuhara Y: Differential phase-contrast microscopy at atomic resolution, Nature Physics 8, 611 (2012).
• Matsumoto T, So YG, Kohno Y, Sawada H, Ikuhara Y, Shibata N: Direct observation of Sigma7 domain boundary core structure in magnetic skyrmion lattice, Sci. Adv. 2:e1501280 (2016)

Examples (Sample Data)

Download

You have to purchase a license (hardware key) to run this program.
Please send your price enquiry to support@hremresearch.com.

• qDPC v1.3
  for GMS 3.4 (64bit)
  for GMS 3.3 (64bit) (applicable from GMS 3.0)
  for GMS 2.3 32bit    GMS 2.3 64bit
  for GMS 2.1 32bit    GMS 2.1 64bit (applicable from GMS 2.0)

• 4D-STEM Module for qDPC v1.3 STEMx module
  for GMS 3.4 (64bit)
  for GMS 3.3 (64bit) (applicable from GMS 3.0)
  for GMS 2.3 64bit
  for GMS 2.1 64bit (applicable from GMS 2.0)

• 4DCanvas module
  for GMS 3.4 (64bit)
  for GMS 3.3 (64bit) (applicable from GMS 3.0)
  for GMS 2.3 64bit
  for GMS 2.1 64bit (applicable from GMS 2.0)

• SD module
  for GMS 3.4 (64bit)
  for GMS 3.3 (64bit) (applicable from GMS 3.0)

Required plug-ins.

• IPU plug-in (Free Software)

User Key Driver

• User Key Driver / Remote Update System (RUS)

Previous versions

• qDPC v1.2
  for GMS 3.3 (64bit) (applicable from GMS 3.0)
  for GMS 2.3 32bit    GMS 2.3 64bit
  for GMS 2.1 32bit    GMS 2.1 64bit (applicable from GMS 2.0)

• 4D-STEM Module for qDPC v1.2 STEMx module
  for GMS 3.3 (64bit) (applicable from GMS 3.0)
  for GMS 2.3 64bit
  for GMS 2.1 64bit (applicable from GMS 2.0)

• 4DCanvas module
  for GMS 3.3 (64bit) (applicable from GMS 3.0)
  for GMS 2.3 64bit
  for GMS 2.1 64bit (applicable from GMS 2.0)

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