4.4 Article

Aberration-corrected transmission electron microscopy with Zernike phase plates

期刊

ULTRAMICROSCOPY
卷 239, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.ultramic.2022.113564

关键词

Aberration-corrected transmission electron; microscopy; Physical phase plate; Phase contrast; Material science; Nanomaterials

资金

  1. German Research Foundation (DFG) [7675/1-1]
  2. European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [889546]
  3. Spanish MICINN [PID2019-104739GB-100/AEI/10.13039/501100011033]
  4. Government of Aragon [E13-20R]
  5. European Union H2020 programs [823717, 881603]
  6. Marie Curie Actions (MSCA) [889546] Funding Source: Marie Curie Actions (MSCA)

向作者/读者索取更多资源

In this paper, the possibility of applying physical phase plates (PPs) in combination with aberration-corrected transmission electron microscopy is explored. The results of calculations and experiments demonstrate the benefits of this approach, including enhanced phase contrast and the ability to simultaneously image atomic-resolution structures and morphological features.
We explore the possibility of applying physical phase plates (PPs) in combination with aberration-corrected transmission electron microscopy. Phase-contrast transfer characteristics are calculated and compared for a thin-film based Zernike PP, a hole-free (HF) or Volta PP and an electrostatic Zach PP, considering their phase shifting properties in combination with partial spatial coherence. The effect of slightly converging illumination conditions, often used in high-resolution applications, on imaging with PPs is discussed. Experiments with an unheated Zernike PP applied to various nanomaterial specimens and a qualitative analysis clearly demonstrates the general compatibility of PPs and aberration-corrected transmission electron microscopy. Calculations and experiments show the benefits of the approach, among which is a strong phase-contrast enhancement of a large range of spatial frequencies. This allows the simultaneous imaging of atomic-resolution structures and morphological features at the nanometer scale, with maximum phase contrast. The calculations can explain why the HFPP damps contrast transfer at higher spatial frequencies.

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