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. 2018 Jun 25;9:2462. doi: 10.1038/s41467-018-04861-x

Fig. 2.

Fig. 2

Topological photonic crystal. a Design of the photonic crystal and photonic band gap with nontrivial topology (Chern numbers labeled by red numbers) by gapping out the Dirac points (red arrow) using an external magnetic field. b Illustration of the Brillouin zone, the dispersion, and the Zak phase along the XM (YM) line (the red (cyan) curves), and the field profiles of the first band. c Edge states from simulation (red and blue curves) and experiments (square blocks, only at one edge). Bulk bands are represented by gray areas. d Nonreciprocal light propagation: the forward (panel I) and backward (panel II) transmission as functions of frequency and the distance between the source and the detection points along the edge. The black dashed box indicates pronounced nonreciprocal photon transport along the edge