Fig. 6: Electric field distributions over large-area zero-index PhC slabs with (a, c) and without (b, d) BICs.

a, b The PhC slab is excited by a plane wave incident from the left. c, d The PhC slab is excited by an electric dipole at the centre of the material. The structural parameters of the BIC zero-index PhC slabs in (a, c) are r = 180 nm, a = 733 nm, and h = 1085 nm. The structural parameters of the zero-index PhC slabs without BICs in (b) are r = 180 nm, a = 733 nm, and h = 1200 nm and (d) are r = 180 nm, a = 733 nm, and h = 1247 nm