The comparative study of bulk magneto-phonon and magnetic polaritons of lateral antiferromagnetic superlattices for potential THz applications

•Bulk magneto-phonon and magnetic polaritons in the THz frequency regime are discussed.•Negative refraction at certain frequencies is predicted in lateral FeF2/TlBr superlattice.•This appealing nature can be adjusted by the applied magnetic field and the antiferromagnetic volume fraction.

Bulk magneto-phonon and magnetic polaritons of lateral antiferromagnetic superlattices for potential THz applications have been investigated in the framework of the effective medium theory. The dispersion relations applied for the system are displayed. In contrast with lateral FeF2/SiO2 superlattice, some fascinating polariton modes with negative group velocity signifying photonic band gap scenarios and attractive optical properties are observed from the numerical results presented with the example, lateral FeF2/TlBr superlattice.