Generation of extreme-ultraviolet beams with time-varying orbital angular momentum
Generation of extreme-ultraviolet beams with time-varying orbital angular momentum
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DOI：
10.1126/science.aaw9486
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发表时间：
2019-06-28
期刊：
影响因子：
56.9
通讯作者：
Hernandez-Garcia, Carlos
中科院分区：
文献类型：
--
作者：
Rego, Laura;Dorney, Kevin M.;Hernandez-Garcia, Carlos
携带轨道角动量（OAM）的光场为光通信、显微镜、量子光学和微粒操纵中的应用提供了强大的能力。我们介绍了光束的一个属性，表现为时间OAM变化沿着脉冲：光的自转矩。虽然自转矩存在于不同的物理系统中（即，电动力学和广义相对论），人们没有意识到光可以拥有这样的属性。我们证明了极紫外自扭转光束是在不同OAM的延时脉冲驱动下产生的高次谐波。我们利用极紫外光束的方位频率啁啾来监测其自力矩。这类动态OAM光束提供了控制磁、拓扑和量子激发以及在其自然时间和长度尺度上操纵分子和纳米结构的能力。
Light fields carrying orbital angular momentum (OAM) provide powerful capabilities for applications in optical communications, microscopy, quantum optics, and microparticle manipulation. We introduce a property of light beams, manifested as a temporal OAM variation along a pulse: the self-torque of light. Although self-torque is found in diverse physical systems (i.e., electrodynamics and general relativity), it was not realized that light could possess such a property. We demonstrate that extreme-ultraviolet self-torqued beams arise in high-harmonic generation driven by time-delayed pulses with different OAM. We monitor the self-torque of extreme-ultraviolet beams through their azimuthal frequency chirp. This class of dynamic-OAM beams provides the ability for controlling magnetic, topological, and quantum excitations and for manipulating molecules and nanostructures on their natural time and length scales.