Extended Data Fig. 5: Experimental setups.
From: Topological Chern vectors in three-dimensional photonic crystals
a, Top view of the fabricated sample in Fig. 2a, where the first copper plate on the top is shifted for visualization. b, Copper pillars inserted into the coupling holes to function as metallic obstacles. c, Electromagnet used to produce magnetic fields. d, Triangular samples whose three wall surfaces are identical. e, Setup of two interfaced photonic crystals with perpendicular Chern vectors used in the demonstration in Fig. 4.
