Fig. 3
From: Topological beaming of light: proof-of-concept experiment

Angle-resolved transmission spectra demonstrating topological phase transition and emergence of the Jackiw-Rebbi state. a Topological phase, F = 0.3, a = 880 nm. b Critical phase, F = 0.44, a = 860 nm. c Trivial phase, F = 0.6, a = 840 nm. d Topological junction sample, revealing a localized JR state within the bandgap