Overlapping the electric and magnetic dipole resonances of a silver 2D Babinet-type metasurface: Broadband high reflectance with local field enhancement.

Optical properties are numerically studied of a plasmonic planar 2D noble metal nanostructure with the design inspired by Babinet's principle. We stack a 2D array of nanodisks and a complementary screen—2D periodically perforated film—so that they are separated by a dielectric spacer. Near-field interaction between electric and magnetic dipoles induced in metal metasurfaces results in increased reflectance and suppressed absorption, canceling out initial resonances in the individual nanostructures. The proposed metasurface has polarization- and angle of incidence-independent response in a wide frequency range as compared to the resonance bandwidth. The proposed design is robust to possible structural imperfections. [ABSTRACT FROM AUTHOR]