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- W3133763037 abstract "Fast electrons spectromicroscopies enable to measure quantitatively the optical response of excitations with unrivaled spatial resolution. However, due to their inherently scalar nature, electron waves cannot access to polarization-related quantities. In spite of promising attempts based on the conversion of concepts originating from singular optics (such as vortex beams), the definition of an optical polarization analogue for fast electrons has remained a dead letter. Here, we establish such an analogue as the dipole transition vector of the electron between two well-chosen singular wave states. We show that electron energy-loss spectroscopy (EELS) allows a direct measurement of the textit{polarized} electromagnetic local density of states. In particular, in the case of circular polarization, it measures directly the local optical spin density. This work establishes EELS as a quantitative technique to tackle fundamental issues in nano-optics, such as super-chirality, the local polarization of dark excitations or polarization singularities at the nanoscale." @default.
- W3133763037 created "2021-03-15" @default.
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- W3133763037 date "2021-03-04" @default.
- W3133763037 modified "2023-10-13" @default.
- W3133763037 title "Optical polarization analogue in free electron beams" @default.
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- W3133763037 doi "https://doi.org/10.1038/s41567-021-01163-w" @default.
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