@article{11850,
  author = {Laura Rego and Kevin Dorney and Nathan Brooks and Quynh Nguyen and Chen-Ting Liao and Julio San Román and David Couch and Allison Liu and Emilio Pisanty and Maciej Lewenstein and Luis Plaja and Henry Kapteyn and Margaret Murnane and Carlos Hernández-García},
  title = {Generation of extreme-ultraviolet beams with time-varying orbital angular momentum},
  abstract = {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.},
  year = {2019},
  journal = {Science},
  volume = {364},
  chapter = {eaaw9486},
  pages = {eaaw9486},
  month = {2019-06},
  issn = {0036-8075},
  url = {https://science.sciencemag.org/content/364/6447/eaaw9486.full},
  doi = {10.1126/science.aaw9486},
}