1Huazhong University of Science and Technology, Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Wuhan, China
Fig. 1. Analogy between the Dammann grating and the azimuthal binary phase grating (OAM comb). (a) Dammann grating and spatial beam array. (b) Azimuthal binary phase grating and OAM comb.