Figure 4: Demonstration of topological edge state.
From: Probing topological protection using a designer surface plasmon structure
(a) Simulated band diagram of the narrow-band designer surface plasmon structure. (b) Observed field pattern when the excitation is inside the bulk at frequency 11.3 GHz. (c) Observed edge state at frequency 11.3 GHz. (d) Transmission spectra of configurations in c,e and g. (e) The defect (shown in h) causes strong reflection for a 1D lattice (f). (g) The edge state circumvents a defect lattice (shown in i) consisting of metallic rods with height s=3.5 mm. All other rods have the height h=5.0 mm.
