Angular Momentum of Twisted Radiation from an Electron in Spiral Motion
Angular Momentum of Twisted Radiation from an Electron in Spiral Motion
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DOI：
10.1103/physrevlett.118.094801
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发表时间：
2017-02-27
影响因子：
8.6
通讯作者：
Takashima, Y.
中科院分区：
文献类型：
--
作者：
Katoh, M.;Fujimoto, M.;Takashima, Y.
我们首次从理论上证明，单个自由电子在圆周或螺旋运动时，除了自旋角动量外，还会沿着电子循环的轴线发射带有明确轨道角动量的扭曲光子。结果表明，当电子速度为相对论时，辐射场包含简谐分量，第l次简谐光子携带L个总角动量。这项工作表明，扭曲的光子是由自由电子自然发出的，在实验室和自然界中比人们想象的更普遍。
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 lth harmonic carry l. 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.