Exploration of the thickness-depended dynamic properties of differential phase contrast (DPC) and integrated differential phase contrast (iDPC)

Yuming Gai; Fang Lin; Suiyan Tan; Yuan Yao

doi:10.1016/j.micron.2024.103705

Exploration of the thickness-depended dynamic properties of differential phase contrast (DPC) and integrated differential phase contrast (iDPC)

Micron. 2024 Nov:186:103705. doi: 10.1016/j.micron.2024.103705. Epub 2024 Aug 21.

Authors

Yuming Gai¹, Fang Lin², Suiyan Tan³, Yuan Yao⁴

Affiliations

¹ College of Electronic Engineering, South China Agricultural University, Guangzhou 510642, China; Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
² College of Electronic Engineering, South China Agricultural University, Guangzhou 510642, China.
³ College of Electronic Engineering, South China Agricultural University, Guangzhou 510642, China. Electronic address: tansuiyan@scau.edu.cn.
⁴ Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: yaoyuan@iphy.ac.cn.

PMID: 39186889
DOI: 10.1016/j.micron.2024.103705

Abstract

A study on DPC and iDPC images of crystals is achieved with simulation. It highlights the use of electron wave intensity distribution to visualize the dynamic effect on DPC and iDPC contrasts. Electron waves near heavy atoms exhibit significant oscillations and rapid intensity decay. This oscillation causes DPC and iDPC signal inversion. Bloch wave theory is used to derive DPC and iDPC intensity distributions, elucidating the impact of dynamic effect on the contrast.

Keywords: DPC simulation; Dynamic effect; Exit wave; IDPC simulation.