Bliokh Konstantin Y
Theoretical Quantum Physics Laboratory, RIKEN Cluster for Pioneering Research, Wako-shi, Saitama 351-0198, Japan.
Phys Rev Lett. 2021 Jun 18;126(24):243601. doi: 10.1103/PhysRevLett.126.243601.
Recently, spatiotemporal optical vortex pulses carrying a purely transverse intrinsic orbital angular momentum were generated experimentally [Optica 6, 1547 (2019)OPTIC82334-253610.1364/OPTICA.6.001547; Nat. Photonics 14, 350 (2020)NPAHBY1749-488510.1038/s41566-020-0587-z]. However, an accurate theoretical analysis of such states and their angular-momentum properties remains elusive. Here, we provide such analysis, including scalar and vector spatiotemporal Bessel-type solutions as well as description of their propagational, polarization, and angular-momentum properties. Most importantly, we calculate both local densities and integral values of the spin and orbital angular momenta, and predict observable spin-orbit interaction phenomena related to the coupling between the transverse spin and orbital angular momentum. Our analysis is readily extended to spatiotemporal vortex pulses of other natures (e.g., acoustic).
最近，实验上产生了携带纯横向固有轨道角动量的时空光学涡旋脉冲[《光学》6, 1547 (2019)OPTIC82334 - 253610.1364/OPTICA.6.001547；《自然·光子学》14, 350 (2020)NPAHBY1749 - 488510.1038/s41566 - 020 - 0587 - z]。然而，对这类状态及其角动量特性进行精确的理论分析仍然难以实现。在此，我们给出这样的分析，包括标量和矢量时空贝塞尔型解，以及对它们的传播、偏振和角动量特性的描述。最重要的是，我们计算了自旋和轨道角动量的局部密度以及积分值，并预测了与横向自旋和轨道角动量之间耦合相关的可观测自旋 - 轨道相互作用现象。我们的分析很容易扩展到其他性质的时空涡旋脉冲（例如，声学的）。
