A dual-asymmetry compensation strategy cancels substrate-induced radiation to recover tunable bound states in the continuum with infinite Q-factor and polarization vortex in substrate-supported photonic crystal slabs.
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Supercritical coupling emerges from causality-driven reactive coupling in bright-dark supermodes, producing an open-Dirac singularity and generalized BICs where radiative losses and effective gain balance to diverge the total Q factor.
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Theory of Supercritical Coupling And Generalized Bound States in the Continuum
Supercritical coupling emerges from causality-driven reactive coupling in bright-dark supermodes, producing an open-Dirac singularity and generalized BICs where radiative losses and effective gain balance to diverge the total Q factor.