Fig. 3: Experimental and theoretical band structures of the elliptical micropillar chain.

a Angle-resolved emission spectrum of the elliptical micropillar chain with a lattice constant a. b Difference between σ_± polarisation-resolved band structures. Due to experimental limitations, optimal circular polarisation detection is only achievable for k_x = 0, with reduced detection efficiency at larger k_x. Therefore, only the first Brillouin zone is depicted. To further address mirror symmetry breaking k_x → − k_x introduced by the detection setup, the spectrum is symmetrized around k_x = 0. The unsymmetrized spectrum is displayed in Fig. 6 in the methods section. c Simulated band structure of a finite micropillar chain, demonstrating agreement with experimental data. d Polarisation-resolved band structure of an infinite micropillar chain.