通过同时守恒自旋轨道动量来控制阿秒高次谐波光束的偏振和涡旋电荷。
Controlling the polarization and vortex charge of attosecond high-harmonic beams via simultaneous spin-orbit momentum conservation.
作者信息
Dorney Kevin M, Rego Laura, Brooks Nathan J, Román Julio San, Liao Chen-Ting, Ellis Jennifer L, Zusin Dmitriy, Gentry Christian, Nguyen Quynh L, Shaw Justin M, Picón Antonio, Plaja Luis, Kapteyn Henry C, Murnane Margaret M, Hernández-García Carlos
机构信息
JILA - Department of Physics, University of Colorado and NIST, Boulder, CO, USA.
Grupo de Investigación en Aplicaciones del Láser y Fotónica, Departamento de Física Aplicada, University of Salamanca, Salamanca, Spain.
出版信息
Nat Photonics. 2018;13(2). doi: https://doi.org/10.1038/s41566-018-0304-3.
Optical interactions are governed by both spin and angular momentum conservation laws, which serve as a tool for controlling light-matter interactions or elucidating electron dynamics and structure of complex systems. Here, we uncover a form of simultaneous spin and orbital angular momentum conservation and show, theoretically and experimentally, that this phenomenon allows for unprecedented control over the divergence and polarization of extreme-ultraviolet vortex beams. High harmonics with spin and orbital angular momenta are produced, opening a novel regime of angular momentum conservation that allows for manipulation of the polarization of attosecond pulses-from linear to circular-and for the generation of circularly polarized vortices with tailored orbital angular momentum, including harmonic vortices with the same topological charge as the driving laser beam. Our work paves the way to ultrafast studies of chiral systems using high-harmonic beams with designer spin and orbital angular momentum.
光学相互作用受自旋和角动量守恒定律支配，这些定律是控制光与物质相互作用或阐明复杂系统中电子动力学和结构的工具。在此，我们揭示了一种同时存在的自旋和轨道角动量守恒形式，并通过理论和实验表明，这一现象能够以前所未有的方式控制极紫外涡旋光束的发散和偏振。产生了具有自旋和轨道角动量的高次谐波，开启了角动量守恒的全新领域，可用于操纵阿秒脉冲的偏振——从线性偏振到圆偏振——以及产生具有定制轨道角动量的圆偏振涡旋，包括与驱动激光束具有相同拓扑电荷的谐波涡旋。我们的工作为利用具有设计好的自旋和轨道角动量的高次谐波光束对手性系统进行超快研究铺平了道路。
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