Non-Hermitian metasurface with non-trivial topology.

ABSTRACT: The synergy between topology and non-Hermiticity in photonics holds immense potential for next-generation optical devices that are robust against defects. However, most demonstrations of non-Hermitian and topological photonics have been limited to super-wavelength scales due to increased radiative losses at the deep-subwavelength scale. By carefully designing radiative losses at the nanoscale, we demonstrate a non-Hermitian plasmonic-dielectric metasurface in the visible with non-trivial topology. The metasurface is based on a fourth order passive parity-time symmetric system. The designed device exhibits an exceptional concentric ring in its momentum space and is described by a Hamiltonian with a non-Hermitian Z3 topological invariant of V = -1. Fabricated devices are characterized

SUBMITTER: Yang F 

PROVIDER: S-EPMC11501583 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature