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. By employing a symmetry-breaking method – specifically, varying the opening angle between two silicon rectangles in a metasurface unit cell – we induce in-plane symmetry breaking, leading to eigenmode coupling and the manifestation of EP effects. 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 sensing, light manipulation, and on-chip photonic devices, due to its flexible experimental control over design parameters. #COMESYSO1120.

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Multipole Response of All-Dielectric Metasurface at Exceptional Point

  • Ilia D. Medvedev,
  • Toms Salgals

摘要

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. By employing a symmetry-breaking method – specifically, varying the opening angle between two silicon rectangles in a metasurface unit cell – we induce in-plane symmetry breaking, leading to eigenmode coupling and the manifestation of EP effects. 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 sensing, light manipulation, and on-chip photonic devices, due to its flexible experimental control over design parameters. #COMESYSO1120.