@article { ISI:000529001600002,
	title = {High-purity orbital angular momentum states from a visible metasurface laser},
	journal = {Nature Photonics},
	volume = {14},
	year = {2020},
	pages = {498{\textendash}503},
	publisher = {NATURE PUBLISHING GROUP},
	type = {Article; Early Access},
	address = {MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND},
	abstract = {A metasurface laser generates orbital angular momentum states with quantum numbers reaching l = 100. Simultaneous output vortex beams, with Delta l as great as 90, are demonstrated in the visible regime. Orbital angular momentum (OAM) from lasers holds promise for compact, at-source solutions for applications ranging from imaging to communications. However, conjugate symmetry between circular spin and opposite helicity OAM states (+/- l) from conventional spin-orbit approaches has meant that complete control of light{\textquoteright}s angular momentum from lasers has remained elusive. Here, we report a metasurface-enhanced laser that overcomes this limitation. We demonstrate new high-purity OAM states with quantum numbers reaching l = 100 and non-symmetric vector vortex beams that lase simultaneously on independent OAM states as much as Delta l = 90 apart, an extreme violation of previous symmetric spin-orbit lasing devices. Our laser conveniently outputs in the visible, producing new OAM states of light as well as all previously reported OAM modes from lasers, offering a compact and power-scalable source that harnesses intracavity structured matter for the creation of arbitrary chiral states of structured light.},
	issn = {1749-4885},
	doi = {10.1038/s41566-020-0623-z}, Early Access Date = PR 2020},
	author = {Sroor, Hend and Yao-Wei Huang and Sephton, Bereneice and Naidoo, Darryl and Valles, Adam and Ginis, Vincent and Cheng-Wei Qiu and Antonio Ambrosio and Federico Capasso and Forbes, Andrew}
}
