Fig. 3
From: Scalar optical hopfions
Optical hopfions showing 50 equiphase lines to form ring tori with winding numbers: a l1 = 1, l2 = 1. b l1 = 2, l2 = 2. c l1 = 3, l2 = 4. d l1 = 4, l2 = 2
Fig. 3 | eLight