Band inversion reverses the winding number of polarization singularities at bound states in the continuum in photonic slabs and metasurfaces.
the electric fieldE and magnetic fieldH are in-plan and perpendicular to the propagation vector respectively)
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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.