Insights and alternative proposals on the phase retrieval in high resolution transmission electron microscopy

TL;DR

This paper introduces a new method for directly reconstructing the object exit wave function in high resolution TEM, offering advantages over existing techniques especially for aperiodic features like defects and dopants.

Contribution

The paper proposes an alternative reconstruction approach based on a modified intensity equation, improving direct retrieval of the object exit wave in HRTEM.

Findings

Phase shifts match theoretical values for MoS2, BN, ZnO.

Fourier series expansion effectively retrieves periodic functions.

Method works well for aperiodic features like defects and dopants.

Abstract

Alternative reconstruction method is proposed on retrieving the object exit wave function (OEW) directly from the recorded image intensity pattern in high resolution transmission electron microscopy (HRTEM). The method is based on applying a modified intensity equation representing the HRTEM image. A comparative discussion is provided between the existing methodologies involved in reconstruction of OEW, off-axis electron holography and the present proposal. Phase shift extracted from the experimental images of MoS2, BN and ZnO are found to be in excellent agreement with the theoretical reference values. Additionally, it is shown that the Fourier series expansion of diffraction pattern is effective in retrieving the isolated and periodic image functions of certain form directly. However, for aperiodic object information e.g., defects, dopants, edges etc., the first method works in entirety.