Numerical Modeling of Magnetically Controlled THz Modulators Based on Gratings of Ferromagnetic Metallic Nanowires

The mathematical model of THz nanomagnet grating devices based on the solution of the Maxwell equations together with the Landau-Lifshitz equation including the exchange term, was developed using the decompositional approach by autonomous blocks with Floquet channels, containing the magnetic nanoinsertions (ABFM). The scattering matrices S of THz modulators based on gratings of ferromagnetic metallic nanowires versus the external magnetic field were numerically simulated in the THz band by using developed computational algorithm by ABFMs. The magnetically controlled scattering parameters of THz modulators were examined depending on the intensity and the orientation of the external magnetic field for various grating geometry, in particular versus the diameter and the length of nanowires and the packing density of grating.