Journal
NATURE PHOTONICS
Volume 13, Issue 3, Pages 205-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41566-018-0328-8
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Funding
- Advanced Light Source, a DOE Office of Science User Facility [DE-AC02-05CH11231]
- DOE Office of Science: University of Oregon (Basic Energy Sciences) [DE-SC0010466]
- Advanced Light Source (Basic Energy Sciences, Materials Sciences and Engineering Division) [DE-AC02-05-CH11231]
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Light's capacity to carry angular momentum is integral to our knowledge of physics and ability to probe matter. In addition to spin, photons can occupy free-space orbital angular momentum eigenstates(1,2). Visible light orbital angular momentum is used in quantum information experiments, super-resolution microscopy, optical tweezers and angular momentum transfer to atoms in optical lattices(3,4). Soft X-ray orbital angular momentum applications, slowed by the lack of suitable optics and the rarity of coherent X-ray sources, could enable the direct alteration of atomic states through orbital angular momentum exchange, and methods to study the electronic properties of quantum materials. We have made soft X-ray diffractive optics that generate single Laguerre-Gauss modes, observed carrying up to 30h angular momentum per photon, or their superpositions. We also present Hermite-Gauss diffractive optics and a soft X-ray orbital angular momentum analyser. These tools could enable both the manipulation and finer characterization of topologically complex electronic matter, such as magnetic skyrmions.
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