Dynamic Tuning of Superoscillatory Lensing Based on Reconfigurable Metasurface

Metasurface-based devices have drawn considerable attention in recent years. However, conventional passive metasurfaces can only achieve fixed functionalities once designed. In this paper, we propose a two-dimensional reconfigurable reflective metasurface to realize individual phase modulation of each unit cell. The proposed reflective metasurface is exploited to implement a dynamic superoscillatory lens in the microwave regime that can form sub-diffraction focusing spots at different focusing distances and operating frequencies.