中国物理B ›› 2024, Vol. 33 ›› Issue (9): 96807-096807.doi: 10.1088/1674-1056/ad73b2
所属专题: SPECIAL TOPIC — Stephen J. Pennycook: A research life in atomic-resolution STEM and EELS
Eric R. Hoglund† and Andrew R. Lupini‡
Eric R. Hoglund† and Andrew R. Lupini‡
摘要: Recent advances in scanning transmission electron microscopy (STEM) have led to increased development of multi-dimensional STEM imaging modalities and novel image reconstruction methods. This interest arises because the main electron lens in a modern transmission electron microscope usually has a diffraction-space information limit that is significantly better than the real-space resolution of the same lens. This state-of-affairs is sometimes shared by other scattering methods in modern physics and contributes to a broader excitement surrounding multidimensional techniques that scan a probe while recording diffraction-space images, such as ptychography and scanning nano-beam diffraction. However, the contrasting resolution in the two spaces raises the question as to what is limiting their effective performance. Here, we examine this paradox by considering the effects of aberrations in both image and diffraction planes, and likewise separate the contributions of pre- and post-sample aberrations. This consideration provides insight into aberration-measurement techniques and might also indicate improvements for super-resolution techniques.
中图分类号: (Scanning transmission electron microscopy (STEM))