In this paper, we have demonstrated a detailed study of Electromagnetic interaction with a biased gyromagnetic medium. Our key contributions in this paper are
For the first time, we categorized the topology classes of isofrequency surfaces and identified the connection between the evolution of the isofrequency surface topology with the gyrotropicity of the medium.
We revealed the relation between photonic-spin and the isofrequency topology.
The existence of cutoff-less waveguide modes is shown in the paper, owing to the hyperbolic isofrequency surface topology. This paves the way for extremely small guided structures.
A new type of cut-off for the waveguide mode is revealed, which we call gyrotropy-induced cut-off. This cut-off manifests as a result of interaction between the material-induced and structure-induced photonic spins.
This paper got published online in Physical Review A on 25th February 2022.