Ultra-wideband ferromagnetic metamaterials in high-intensity magnetic biased fields

Abstract

The paper presents numerical simulation results of a magnetic field biased management of the dispersion responses of electromagnetic waves (EMWs) propagating in a parallel-plate waveguide (PPWG) completely filled with two types of the ferromagnetic metamaterials (FM MMs). The first type corresponds to a single FM MM thin layer that is a dielectric FM thin plate containing a periodic lattice of the dielectrically insulated metal wires. The second type is a two-layer MM structure that consists of a dielectric FM thin plate bordering a dielectric nonmagnetic thin plate. The periodic lattice of the dielectrically insulated metal wires is embedded in both plates. The simulations of the PPWGs with both MM-filling types are made with a finite-difference time-domain Landau–Lifshits–Gilbert (LLG) electromagnetic solver MaxLLG, based on a joint solution of the Maxwell and LLG equations. It is shown that in both cases a bandwidth of the “extraordinary” slow forward EMW is wider by approximately an order of magnitude than a bandwidth of a similar wave existing in the PPWG completely filled with a single FM thin layer without wire inclusions. The ultra-wideband effect is observed only for FM MM thin plates located in high-intensity magnetic biased fields.