Band inversion reverses the winding number of polarization singularities at bound states in the continuum in photonic slabs and metasurfaces.
The tomographic experiment is performed for different polarizations to retrieve polarization-resolved intensities of each mode [see Fig.S5 (a,b)]
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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.