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Atomiclike Selection Rules in Free Electron Scattering
Simon Garrigou1, Hugo Lourenço-Martins1
1Université de Toulouse, CEMES, -CNRS, CNRS, Toulouse, France.
Physical Review Letters
|July 31, 2025
Summary
Phase-shaped electron energy-loss spectroscopy (PSEELS) offers advanced nano-optical analysis beyond mimicking optics. This technique allows mapping previously inaccessible nano-optical quantities, like electric quadrupolar momentum, at the subwavelength scale.
Area of Science:
- Quantum optics
- Electron spectroscopy
- Nanophotonics
Background:
- Phase-shaped electron energy-loss spectroscopy (PSEELS) measures scattering probabilities of structured electron beams.
- PSEELS has been used to emulate polarized optical spectroscopies, enabling subwavelength optical measurements.
- Existing methods transpose macroscopic optical concepts like dichroism to the nanoscale.
Purpose of the Study:
- To theoretically demonstrate advanced capabilities of PSEELS.
- To show PSEELS can surpass the emulation of optical spectroscopies.
- To enable mapping of novel nano-optical quantities.
Main Methods:
- Theoretical demonstration of PSEELS capabilities.
- Utilizing structured free electron beams for scattering measurements.
- Analysis of electron-target interactions at the quantum level.
Main Results:
- PSEELS can achieve more than just mimicking optical techniques.
- The study theoretically proves PSEELS enables access to new nano-optical quantities.
- Electric quadrupolar momentum is identified as a key measurable quantity.
Conclusions:
- PSEELS offers a powerful new platform for nano-optical investigations.
- The technique extends beyond emulating optical spectroscopies.
- PSEELS provides a route to measure fundamental nano-optical properties like electric quadrupolar momentum.
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