Figure 4
From: Slowing down light using a dendritic cell cluster metasurface waveguide

Rainbow trapping experiment.
(a) A schematic of the experimental setup used to observe the rainbow trapping phenomenon. (b) Photographs of the rainbow trapping effect of a single-layer silver dendritic structure metasurface waveguide. (c) Photographs of the “rainbow trapping” effect of a double-layer silver dendritic structure metasurface waveguide.