Fig. 4: Calculated and experimental results of the topological rainbow.
a The top view of the FDTD model, where coordinate axes are marked and light is incident from the waveguide. b The light intensity distributions (|E|2) of the calculated results for different wavelengths. c The topographic image of the sample. The color denotes the height of the surface of the sample. d The light intensity distributions of experimental results for different wavelengths. The comparison between interface intensity and projected bands for calculated (e) and experimental (f) results. In b, d, the position with maximal intensity is marked by the cyan dashed rhombuses, and the corresponding y coordinates are marked in the left. The wavelength of incident light is marked on the top of each figure.
