The Peak Pairs algorithm for strain mapping from HRTEM images

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• 作者：Pedro L. Galindo ; Sł ; awomir Kret ; Ana M. Sanchez ; Jean-Yves Laval ; Andr&#xe9 ; s Y&#xe1 ; ñ ; ez ; Joaqu&#xed ; n Pizarro ; Elisa Guerrero ; Teresa Ben ; Sergio I. Molina
• 关键词：Strain mapping ; High-resolution transmission electron microscopy (HRTEM) ; Data processing/image processing
• 刊名：Ultramicroscopy
• 出版年：2007
• 期刊代码：79_03043991
• 类别：ph
• 出版时间：November 2007
• 卷：107
• 期：12
• 页码：1186-1193
• 文件大小：1281 K

摘要

Strain mapping is defined as a numerical image-processing technique that measures the local shifts of image details around a crystal defect with respect to the ideal, defect-free, positions in the bulk. Algorithms to map elastic strains from high-resolution transmission electron microscopy (HRTEM) images may be classified into two categories: those based on the detection of peaks of intensity in real space and the Geometric Phase approach, calculated in Fourier space. In this paper, we discuss both categories and propose an alternative real space algorithm (Peak Pairs) based on the detection of pairs of intensity maxima in an affine transformed space dependent on the reference area. In spite of the fact that it is a real space approach, the Peak Pairs algorithm exhibits good behaviour at heavily distorted defect cores, e.g. interfaces and dislocations. Quantitative results are reported from experiments to determine local strain in different types of semiconductor heterostructures.