Lumped-element models of THz metasurfaces based on split-ring resonators and their complementary form

Realistic lumped-element circuits describing split-ring resonator metasurfaces and their complementary forms are presented. To consider the polarization dependence, we exploit the symmetry of the meta-atoms with respect to the impinging electric field. Our approach enables to describe the circuital architectures including the effect of Ohmic dissipation in real metasurfaces. Lumped-element models describes in a simple way features like enhanced transmission and deep absorption that are observed in metasurfaces and complementary metasurfaces based on split-r ing resonators. (c) 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement