Exploring the Photonic Spectrum of Plasma Superlattice with Magnetic Fields

In this study, we investigate how an external magnetic field that can have any direction affects a superlattice’s photonic band structure, composed of alternating dielectric and plasma layers. By deriving the dispersion equations, we show that the photonic spectrum of the superlattice loses its degeneracy and splits into two branches due to the external magnetic field. Moreover, our findings reveal a direction-independent transition from a photonic insulator to a photonic conductor. Interestingly, our results indicate that a superlattice that was previously completely photo-isolating can become entirely photo-conducting, regardless of the direction of the external magnetic field.