[26] P. Yeh, C. Gu. Optics of Liquid Crystal Displays(1999).
[31] A. Zdagkas et al. Observation of toroidal pulses of light. Nat. Photonics, 16, 523-528(2022).
[33] C. He et al. Towards higher-dimensional structured light. Light Sci. Appl., 11, 205(2022).