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. 2023 Nov 14;14:7347. doi: 10.1038/s41467-023-42449-2

Fig. 2. The projected band structures (PBS) of TIs with directional bandgaps.

Fig. 2

a Schematic of a finite-size photonic TI with boundary rods having a smaller radius than the bulk rods. The zoom-in inset presents the position of the probe to measure the projective band structure. The radius of the bulk and edge rods are 0.11a and 0.1a respectively. b The PBS of the unperturbed lattice. The white (blue) lines are the numerically simulated bulk and edge states. The bright and dark colors represent the experimentally measured PBS. The zoom-in inset shows the 1D edge state is an in-gap state. c The PBS of the perturbed lattice. The elements have the same meaning as in (b). The zoom-in inset shows the 1D edge state is embedded into the bulk spectrum for the second band gap.