Large-angle mid-infrared absorption switch enabled by polarization-independent GST metasurfaces

Abstract A tunable G e 3 S b 2 T e 6 metasurface is numerically introduced with near-unity absorption and large tuning range. It has a perfect absorptance of 100% for the crystalline state of G e 3 S b 2 T e 6 . Absorptance will have a low intensity for the amorphous state of G e 3 S b 2 T e 6 . The designed absorber is insensitive to polarization and robust against incident angle. This design may have potential applications in stealth technology, antiradar detection, and phase-sensitive biosensor.