Mode Structure and Orbital Angular Momentum of Spatiotemporal Optical Vortex Pulses
Mode Structure and Orbital Angular Momentum of Spatiotemporal Optical Vortex Pulses
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DOI：
10.1103/physrevlett.127.193901
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发表时间：
2021-11-05
影响因子：
8.6
通讯作者：
Milchberg, H. M.
中科院分区：
文献类型：
--
作者：
Hancock, S. W.;Zahedpour, S.;Milchberg, H. M.
我们确定了一类时空光涡旋（STOV）电磁脉冲在色散介质中传播的模态解，其轨道角动量（OAM）与传播正交。我们发现真空中的对称stov可以携带半整数本征OAM；对于色散介质中的一般非对称STOV， OAM被量化为一个参数的整数倍，该参数取决于STOV对称性和群速度色散。我们的研究结果表明，在色散介质中传播的stov伴随着一个类极化子的准粒子。模态理论与stov自由空间传播的测量结果非常吻合。
We identify a class of modal solutions for spatiotemporal optical vortex (STOV) electromagnetic pulses propagating in dispersive media with orbital angular momentum (OAM) orthogonal to propagation. We find that symmetric STOVs in vacuum can carry half-integer intrinsic OAM; for general asymmetric STOVs in a dispersive medium, the OAM is quantized in integer multiples of a parameter that depends on the STOV symmetry and the group velocity dispersion. Our results suggest that STOVs propagating in dispersive media are accompanied by a polaritonlike quasiparticle. The modal theory is in excellent agreement with measurements of free space propagation of STOVs.