Paraxial and non-paraxial optical skyrmions Jörg Götte, Zhujun Ye, Amy McWilliams, Claire Cisowski, Fiona Speirits, Sonja Franke-Arnold and Stephen M. Barnett EPJ Web Conf., 309 (2024) 11003 Published online: 31 October 2024 DOI: 10.1051/epjconf/202430911003