Faraday Rotation Dynamics in Hybrid Magnetophotonic Metasurfaces

The behavior of Faraday rotation on the femtosecond timescale in Mie-resonant magnetophotonic metasurfaces formed by a two-dimensional array of silicon nanodisks coated with a thin nickel film is studied. It is shown that in the static case, the maximum of polarization plane rotation is at the resonant wavelength for spectrally overlapped electric and magnetic dipole modes. When a single femtosecond laser pulse passes through the designed metasurface, it splits into two pulses with durations twice shorter than the original one, and the polarization planes are rotated in opposite directions, forming almost orthogonal replicas.