Fig. 1. Schematic of the metasurface platform enables dynamic switching between the edge detection and imaging based on the phase transition of GSST

Fig. 2. (a, b) Schematic illustrations of unit cells at different views. (c, d) Simulated phase responses and cross-polarized coefficients of eight unit cells for circularly polarized light at the wavelength of 10.6 μm. The materials of nanofins and substrate are GSST and Si, respectively. Constant parameters: H = 6 μm, P = 4 μm. The length (L) and width (W) of eight unit cells are L= 2.9, 3.0, 3.3, 3.2, 3.5, 3.79, 3.82 and 2.68 μm, W= 1.34, 1.28, 1.2, 1.14, 1.0, 0.83, 0.8 and 1.41 μm

Fig. 3. (a) Schematic illustration of a periodic gradient metasurface for tunable anomalous transmission; (b) The simulated cross-polarized far-field distributions when GSST is amorphous; (c) The simulated cross-polarized far-field distributions when GSST is crystalline

Fig. 4. The simulated image intensity distributions of different states under the 10.6 μm incident beam. (a) The simulated RCP image intensity distributions and normalized intensity distributions of the dotted line on z=100 μm plane when GSST is crystalline; (b) The simulated LCP image intensity distributions and normalized intensity distributions of the dotted line on z=100 μm plane when GSST is crystalline; (c) The simulated edge image intensity distribution and normalized intensity distributions of the dotted line on z=100 μm plane when GSST is crystalline; (d) The simulated LCP image intensity distribution and normalized intensity distributions of the dotted line on z=1000 μm plane when GSST is amorphousSST is amorphous

Fig. 5. (a) The calculation results when the object is "S I C N U", from left to right: object image, imaging, edge detection imaging; (b) The calculation results when the object is the sun and immortal birds, from left to right: object image, imaging, and edge detection imaging; (c) Schematic illustration of the system for image processing