TY - JOUR AU - Laura Rego AU - Kevin Dorney AU - Nathan Brooks AU - Quynh Nguyen AU - Chen-Ting Liao AU - Julio San Román AU - David Couch AU - Allison Liu AU - Emilio Pisanty AU - Maciej Lewenstein AU - Luis Plaja AU - Henry Kapteyn AU - Margaret Murnane AU - Carlos Hernández-García AB - 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. BT - Science DA - 2019-06 DO - 10.1126/science.aaw9486 N2 - 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. PY - 2019 SE - eaaw9486 EP - eaaw9486 T2 - Science TI - Generation of extreme-ultraviolet beams with time-varying orbital angular momentum UR - https://science.sciencemag.org/content/364/6447/eaaw9486.full VL - 364 SN - 0036-8075 ER -