论文题目：Reconfigurable Near-Field Focusing Reflector Based on Superoscillation Mechanism

摘要（英文）：Superoscillation is an extraordinary phenomenon capable of generating small-size focusing spots, which can be used for super-resolution focusing and imaging. Herein, we elaborate on a reconfigurable near-field focusing reflector based on the superoscillation principle, where the focal position and operation frequencies are modulated by the dynamic phase-compensation mechanism of an engineered metamirror. A varactor diode is embedded into each resonant meta-atom, enabling to achieve nearly 340° phase coverage. To validate the proposed reflector, the fabricated metamirror platform is experimentally measured in an anechoic chamber. The results show that the near-field focusing maintains sub-diffraction property when the focal distances and frequencies are flexibly driven by the metamirror. Such a focusing reflector holds great integration potential to imaging devices for its tunability, high resolution, and non-narrow band features.

摘要（中文）：在本论文中，我们详细描述了一个基于超震荡原理的可重构近场聚焦反射器，其中焦距和工作频率可以通过动态相位补偿机制调控。每个可重构谐振单元嵌入一个变容二极管进而实现接近340°的反射相位覆盖。为了验证提出的反射器，对制备的反射超表面平台在微波暗室中进行测试。其结果表明当改变聚焦位置和频率时，该近场聚焦保持超衍射特性。由于其的可调谐性，高分辨率和非窄带特性，该聚焦反射面在成像设备中具有极高的集成可能。