Band inversion reverses the winding number of polarization singularities at bound states in the continuum in photonic slabs and metasurfaces.
Each of them also couples to the radiative continuum with the coupling strengthγ (see Fig
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Band Inversion Flips the Winding of Bound States in the Continuum
Band inversion reverses the winding number of polarization singularities at bound states in the continuum in photonic slabs and metasurfaces.