Fig. 1. [in Chinese]

Fig. 2. Reflectance and phase modulation of each unit structure at an operating frequency of 220 GHz

Fig. 3. Checkerboard combination of metasurfaces

Fig. 4. Simulation results of hyperstructured surface focusing. (a)‒(d) Results under incidence angles of terahertz waves of 45°, 30°, 15°, and 9°, respectively

Fig. 5. Hyperstructured surface sample. (a) Local image of the hyperstructured surface sample; (b) experimental facility diagram

Fig. 6. Focusing signal power corresponding to different terahertz wave incidence angles

Fig. 7. Signal power corresponding to different positions of the signal receiving end