Angular Momentum of Twisted Radiation from an Electron in Spiral Motion
- 27 February 2017
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 118 (9), 094801
- https://doi.org/10.1103/physrevlett.118.094801
Abstract
We theoretically demonstrate for the first time that a single free electron in circular or spiral motion emits twisted photons carrying well-defined orbital angular momentum along the axis of the electron circulation, in adding to spin angular momentum. We show that, when the electron velocity is relativistic, the radiation field contains harmonic components and the photons of th harmonic carry total angular momentum for each. This work indicates that twisted photons are naturally emitted by free electrons and are more ubiquitous in laboratories and in nature than ever thought.
Keywords
Funding Information
- Japan Society for the Promotion of Science (26286081)
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