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. 2024 Apr 12;10(15):eadn6095. doi: 10.1126/sciadv.adn6095

Fig. 3. PSH and VH (PSH-VH) heterogeneous topological boundary modes.

Fig. 3.

(A, D, and G) θ = 0°, (B, E, and H) θ = 40°, and (C, F, and I) θ = 60°. (A) to (C) Optical images of the topological PSH and PSH-VH hybrid structures. (D) to (I) Real-space images of boundary modes propagating unidirectionally by right-handed circular polarized (RCP) [(D) to (F)] and left-handed circular polarized (LCP) [(G) to (I)] excitation around the mid-bandgap. The colored arrows in the real-space images present the position of excitation beam with the spot size ~20 μm at 7.2 μm and polarization (blue, LCP; red, RCP).