Theoretical study of tunable and controllable angular channels based on magnetically controlled metastructures

In current research studies on angular selectivity (AS), researchers mainly focus on bandwidth and polarization characteristics, while the exploration of tunable and dynamic regulation is still relatively limited. In this study, based on the principle of photonic band gap and indium antimonide (InSb), tunable and controllable multi-channel metastructures (MSs) with angular selectivity (AS) were designed. MSs containing photonic band gaps were utilized to form angularly selective channels, while the modulation function was achieved through InSb. The dynamic combination of MS₁, MS₂, and MS₃ enabled the function of angularly selective windows (ASWs). The dual modulation of temperature and magnetic field on InSb in MS₁ and MS₃ introduced tunable characteristics in the device. The left edge at 10° was formed by MS₁, the right edge at 70° was formed by MS₂, and MS₃ contributed to the realization of the multi-edge function. The tunability of the system was demonstrated by adjusting the magnetic field, which had a direct impact on the cyclotron frequency and, consequently, dielectric properties of InSb. By dynamically combining the three MSs, different ASWs can form angular channels, demonstrating the controllability of the system. This research holds potential application value in related technological fields such as radar radiation, signal processing, and electromagnetic stealth.