Polarization-controlled dual quasi-BICs in all-dielectric metasurfaces enabled by refractive-index asymmetry
Bound states in the continuum (BICs) in all-dielectric metasurfaces have attracted considerable interest due to their ability to support ultra-high Q resonances. However, realizing multiple high-Q quasi-BICs (q-BICs) while preserving geometric symmetry remains a significant challenge. In this work, we demonstrate an al...