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Recent realizations of exotic topological states in condensed matter and coldatoms have advanced the exploration for topological characteristics, such asinvariant topological orders and band inversion. Here we construct a 1D opticaldiatomic system made of split ring resonators with electric-magnetic couplingsto implement the topological features. We experimentally measure the dispersionrelationship and sub-lattice pseudo-spin vectors by detecting field strengthdistributions, which determines the accompanying winding number of bulk band asthe topological order. The sub-lattice pseudo-spin vector inversion observed atband-edges evidences the band inversion. We further reconfirm theband-inversion-induced topological phase transition by measuring the symmetryexchanges at band-edges. These results have shown the great potential of splitring resonator platform to experimentally explore the advanced topologicalcharacteristics, such as high winding numbers or even high Chern numbers inmore exotic setups.

Seeing Topological Order and Band Inversion in Optical Diatomic Chain