Chiral lasing via broken parity-time symmetry in bound-state-in-the-continuum metasurfaces

Matthew Parry, Daria A. Smirnova, Andrey A. Sukhorukov +1

The paper proposes a planar metasurface design that uses spatial gain‑loss modulation to break parity‑time symmetry, enabling chiral lasing that emits nearly pure circularly polari…