Magneto-optical angle selector based on a 1D InAs photonic crystal achieving dynamic polarization separation via...

To overcome the persistent challenges in current angle-selective technologies, particularly the trade-off between structural compactness and dynamic tunability, a one-dimensional magnetic photonic crystal is introduced. The proposed structure leverages the magnetoplasmonics of epsilon-near-zero (ENZ) Indium Arsenide to achieve a sharp angular cutoff via magnetically tunable total internal reflection. The proposed configuration, composed of ENZ Indium Arsenide and dynamic anti-reflection structures (AFS), is designed to operate based on the principles of total internal and Bragg reflection. Theoretical calculations, performed via the transfer matrix method, show that the engineered AFS mitigates material resonance defects. This creates a rectangular transmission window surpassing 0.9 across a ± 55° wide-angle range and demonstrates exceptional polarization and angular robustness. Moreover, the application of an external magnetic field enables the dynamic separation of transverse electric (TE) and transverse magnetic (TM) waves. The magnetic field selectively compresses the angular passband of TM waves through the Lorentz force, while TE waves remain fundamentally unperturbed, thereby allowing for dynamic switching among three operational modes comprising dual polarization transparency, polarization separation, and total blocking. Furthermore, this magneto-optical effect is also evident in the frequency domain, where the elevation of the TM wave passband to higher frequencies creates a tunable TE passband filter. Consequently, the proposed design offers an innovative framework for high-performance, multifunctional optical switches, polarization splitters, and dynamic filters.