Theoretical study of tunable and controllable angular channels based on magnetic-controlled metastructure

Abstract

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