Figure 7

Far-field scattering from circularly polarized excitations. The Ω _l ’s of the HPI subradiant states are shown for (a) two-atom (l = 1), (b) three-atom (l = 1 and 2), and (c) four-atom cases (l = 1 and 2), at r/λ = 0.2. (d) The far-field scatterings of a single ring (same N and r for Fig. 4) with a circularly polarized excitation with l = 1, 2, 5, 9, and 10 are illustrated horizontally. The fitted exponential decay rates (in units of Γ/2), Γ _f  = (a) 0.7, (b) 0.57 for both modes, (c) 0.7, 0.11, (d) 4, 3.3, 0.018, 7 × 10⁻⁸, and 3.5 × 10⁻⁹, respectively.