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(A) Parameter θ as a function of the x-coordinate along the adiabatically varying heterogeneous topological domain wall. (B) Real-space image of topological boundary modes with LCP excitation at θ = 0° without filtering. (C) LCP and (D) RCP components of the far field of the edge modes. The blue arrows in the real-space images present the position of LCP excitation with the spot size ~20 μm at 7.2 μm.
