Optical polarization analogue in free electron beams

@article{LourenoMartins2020OpticalPA,
  title={Optical polarization analogue in free electron beams},
  author={H. Lourenço-Martins and D. G'erard and M. Kociak},
  journal={arXiv: Optics},
  year={2020}
}
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… Expand
2 Citations

Figures from this paper

Tailored high-contrast attosecond electron pulses for coherent excitation and scattering
Temporally shaping the density of electron beams using light forms the basis for a wide range of established and emerging technologies, including free-electron lasers and attosecond electronExpand
Polarization out of the vortex
The virtual photons that are exchanged when a free-electron vortex beam interacts with a nanoscopic target unlock an explicit connection between polarized optical spectroscopy and the inelasticExpand

References

SHOWING 1-10 OF 111 REFERENCES
Optical excitations in electron microscopy
This review discusses how low-energy, valence excitations created by swift electrons can render information on the optical response of structured materials with unmatched spatial resolution. ElectronExpand
Electron-beam spectroscopy for nanophotonics
TLDR
Spatially resolved electron microscopy techniques, such as cathodoluminescence and electron energy-loss spectroscopy can provide high space, energy and time resolutions for the structural and optical characterization of materials; this Review discusses recent progress and future directions in the field of nanophotonics. Expand
Theory and applications of free-electron vortex states
Abstract Both classical and quantum waves can form vortices : entities with helical phase fronts and circulating current densities. These features determine the intrinsic orbital angular momentumExpand
Chirality and angular momentum in optical radiation
This paper develops, in precise quantum electrodynamic terms, photonic attributes of the "optical chirality density", one of several measures long known to be conserved quantities for a vacuumExpand
Production and application of electron vortex beams
TLDR
This technique is a reproducible method of creating vortex electron beams in a conventional electron microscope, and it is demonstrated how they may be used in electron energy-loss spectroscopy to detect the magnetic state of materials and describe their properties. Expand
Measuring the orbital angular momentum spectrum of an electron beam
TLDR
This work proposes, design and demonstrates the performance of a device based on nanoscale holograms for measuring an electron's OAM components by spatially separating them and employs the device to analyse the OAM spectrum of electrons that have been affected by a micron-scale magnetic dipole, establishing that the sorter can be an instrument for nanoscales magnetic spectroscopy. Expand
Spectral field mapping in plasmonic nanostructures with nanometer resolution
TLDR
It is demonstrated how to directly measure the inelastic momentum transfer of surface plasmon modes via the energy-loss filtered deflection of a focused electron beam in a transmission electron microscope. Expand
Generation of electron beams carrying orbital angular momentum
TLDR
The generation of an electron beam with a phase singularity propagating in free space is reported by passing a plane electron wave through a spiral phase plate constructed naturally from a stack of graphite thin films. Expand
Tracking nanoscale electric and magnetic singularities through three-dimensional space
The study of light fields near nanophotonic structures continually reveals new fundamental features of light–matter interactions on the nanoscale, driving advances in fields ranging from nonlinearExpand
Probing the symmetry of the potential of localized surface plasmon resonances with phase-shaped electron beams
TLDR
This work deliberately shaping the wave function of an electron beam to match a plasmonic excitations' symmetry in a modified transmission electron microscope shows experimentally and theoretically that this offers selective detection of specific plAsmon modes within metallic nanoparticles, while excluding modes with other symmetries. Expand
...
1
2
3
4
5
...