Doubly degenerate guided-mode resonances in a square pillar metasurface merge eight accidental BICs at the Γ point, giving Q ∝ k^-4 and zero topological charge.
Tailoring topological nature of merging bound states in the continuum by manipulating structure symmetry of the all-dielectric metasurface,
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Degenerate merging BICs in resonant metasurfaces
Doubly degenerate guided-mode resonances in a square pillar metasurface merge eight accidental BICs at the Γ point, giving Q ∝ k^-4 and zero topological charge.