Publication Date:
2018-03-30
Description:
Publication date: Available online 27 March 2018 Source: Ultramicroscopy Author(s): Roy Shiloh, Roei Remez, Peng-Han Lu, Lei Jin, Yossi Lereah, Amir H. Tavabi, Rafal E. Dunin-Borkowski, Ady Arie Nearly eighty years ago, Scherzer showed that rotationally symmetric, charge-free, static electron lenses are limited by an unavoidable, positive spherical aberration. Following a long struggle, a major breakthrough in the spatial resolution of electron microscopes was reached two decades ago by abandoning the first of these conditions, with the successful development of multipole aberration correctors. Here, we use a refractive silicon nitride thin film to tackle the second of Scherzer's constraints and demonstrate an alternative method for correcting spherical aberration in a scanning transmission electron microscope. We reveal features in Si and Cu samples that cannot be resolved in an uncorrected microscope. Our thin film corrector can be implemented as an immediate low cost upgrade to existing electron microscopes without re-engineering of the electron column or complicated operation protocols and can be extended to the correction of additional aberrations.
Print ISSN:
0304-3991
Topics:
Electrical Engineering, Measurement and Control Technology
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Natural Sciences in General
,
Physics
