On the Optical response of all-dielectric metasurface in the exceptional point

All-dielectric nanophotonics leverages high-refractive-index dielectric materials to manipulate light at the nanoscale with minimal energy loss, offering strong electric and magnetic resonances. These properties make all-dielectric structures ideal for a range of advanced photonic applications, from ultra-thin lenses to sensors. In this study, we explore the multipole response of all-dielectric metasurfaces when operating near an exceptional point (EP), a singularity in non-Hermitian systems where eigenmodes coalesce. Numerical simulations reveal that at the EP, the metasurface’s resonance splits, with significant contributions from magnetic dipole (MD) and electric quadrupole (EQ) modes. These findings enhance our understanding of EPs in metasurface physics and highlight the potential of this geometry for applications in photonic devices.