[7] [7] Huang H, Yue Y, Ahmed N, et al. Systems and techniques for orbital angular momentum based reconfigurable switching: 2015/349910 A1[P]. 2015-12-03.

[8] [8] Du J, Li S H, Zhao Y F, et al. Demonstration of M-ary encoding/decoding using visible-light Bessel beams carrying orbital angular momentum (OAM) for free-space obstruction-free optical communications[C]//Proceedingsof2015OpticalFiberCommunicationsConferenceandExhibition (OFC), Los Angeles, CA, 2015. doi: 10.1364/OFC.2015.M2F.4.

[10] [10] Li S H, Xu Z D, Liu J, et al. Experimental demonstration of free-space optical communications using orbital angular momentum (OAM) array encoding/decoding[C]//Proceedingsof2015ConferenceonLasersandElectro-Optics (CLEO), San Jose, CA, 2015. doi: 10.1364/CLEO_AT.2015.JTh2A.67.

[50] [50] Bovino F A, Braccini M, Bertolotti M. Design of a programmable spiral phase mirror[Z]. arXiv: 1111.3483, 2012. https://doi.org/10.48550/arXiv.1111.3483.