Bound States in a Continuum Empowering Maximum Chirality and Strong Coupling Regime in Plasmonic Metasurfaces

Maximing the chiral response in photonic and plasmonic systems is a key goal in current nanophotonics research. Bound states in a continuum (BIC) in dielectric metasurfaces are known to yield ultra-narrow resonances, with low radiative losses and enhanced radiation-matter interaction [1]. They give rise to topological singularities that split into circularly polarized states (CPS) with maximum chirality upon symmetry breaking [2], [3].