Magnetoplasmonic crystals (MPC) composed of a 1D gold grating on top of a magnetic garnet layer made by a combined ion-beam etching technique are studied. We demonstrate that this method allows to make high-quality MPC. It is shown that MPC with a 30-40 nm thick perforated gold layer provides an effective excitation of two surface plasmon-polariton modes and several numbers of waveguide modes in the garnet layer. An enhancement of the transversal magneto-optical effect up to the value of 10(-2) is observed for all types of resonant modes, that propagate in the magnetic layer, due to magnetic-field control over the mode excitation which is promising for future photonic devices.

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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.