English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The orbital angular momentum (OAM) sorter is a new electron optical devicefor measuring an electron s OAM. It is based on two phase elements, which arereferred to as the unwrapper and corrector and are placed in Fourier conjugateplanes in an electron microscope. The most convenient implementation of thisconcept is based on the use of electrostatic phase elements, such as a chargedneedle as the unwrapper and a set of electrodes with alternating charges as thecorrector. Here, we use simulations to assess the role of imperfections in sucha device, in comparison to an ideal sorter. We show that the finite length ofthe needle and the boundary conditions introduce astigmatism, which leads todetrimental cross-talk in the OAM spectrum. We demonstrate that an improvedsetup comprising three charged needles can be used to compensate for thisaberration, allowing measurements with a level of cross-talk in the OAMspectrum that is comparable to the ideal case.

Design of electrostatic phase elements for sorting the orbital angular momentum of electrons