Broadband and wide-angle beam deflection enabled by dynamically reconfigurable meta-arrays

Abstract: We present a structurally simple yet functionally ver- satile reflective meta-array composed of phase-change Antimony trisulfide (Sb2S3) nanorods enabling broad- band and wide-angle beam deflection in near-infrared. The device achieves over 80% deflection efficiency over a 1000 nm wide passband, and covering from O-band (1260 nm-1360 nm) to U-band (1565 nm-1625 nm) in the amorphous state. Meanwhile, in its crystalline state, we see a reduction of the efficiency to 40% on average with a maximum passband of 800 nm over the C-band. Moreover, its simple architecture simultaneously en- ables spectral filtering and beam splitting, delivering a compact, multifunctional solution optimized for high power applications.