Fig. 1. (a) Schematic diagrams of GSST-based metasurface and its constituent; (b) Propagation phase and transmitted amplitude under CP incidence for selected 30 meta-atoms corresponding to the proposed two schemes; Scanning plots of transmission (c), (e) and propagation phase (d), (f) versus dimensions a and b of GSST rectangular nanopillars for LP incidences, respectively

Fig. 2. (a) Schematic diagram of TSSM focusing performance; (b) Electric field intensity of the two focal points of TSSM versus the incident polarization χ; (c)-(g) Electric field intensity distributions in the x-z plane of TSSM upon incident light with different polarization states at λ₀= 4200 nm; (h)-(l) Electric field intensity of focal points along x axis corresponds to (c)-(g), respectively

Fig. 3. (a)-(g) Distributions of electric field intensity in the x-z plane of TSSM with different crystallinity α of GSST under RCP incidence; (h) Electric field intensity of focal point of TSSM versus crystallinity α of GSST

Fig. 4. (a) Schematic diagram of LSSM working principle; (b) Electric field intensity of the two focal points of LSSM versus the incident polarization χ; (c)-(g) Electric field intensity distributions in the x-z plane of LSSM upon incident light with different polarization states at λ₀ = 4200 nm;(h)-(l) Electric field intensity of focal points along z axis (x=0) corresponds to (c)-(g), respectively