0CE8C41F-AA41-41A8-9053-9226E22DB1A6Challenges in Orbital Angular MomentumResearch GrantEP/I012451/1798CB33D-C79E-4578-83F2-72606407192CEPSRCINCOME_ACTUAL209783167914101-A004-4871-976B-6C4F8836A220Orbital angular momentum 25 years on [Invited].Optics express258da61b93b20f8bf28118ee5febc87cPadgett MJ2017-01-01http://dx.doi.org/10.1364/oe.25.01126528788808http://ukpmc.ac.uk/abstract/MED/287888081094-4087http://europepmc.org/abstract/MED/287888082510Journal Article/Review5a3519a5134771.15363921