Broadband high-efficiency reflective metasurfaces for sub-diffraction focusing in the visible

Xinjian Lu, Yinghui Guo, M. Pu, Xiong Li, Xiaoliang Ma, Ping Gao, Xiangang Luo
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Abstract

Super-oscillation phenomenon provides an effective solution for realizing far-field non-invasive super-resolution imaging. However, most super-oscillatory lenses are challenging to balance the working bandwidth and working efficiency, which greatly limits the practical applications of super-oscillation lenses in optical systems. In this work, a broadband high-efficiency super-oscillatory metalens for sub-diffraction focusing about 0.75 times the diffraction limit based on the reflective metasurface is proposed for super-resolution imaging in the visible ranging from 400 nm to 700 nm. Moreover, another metalens with a sub-diffraction focusing spot equal to 0.6 times of the diffraction limit is also designed to prove the universal applicability of the proposed method. The proposed method provides an effective pathway for the development of microscopy, holography, and machine vision.
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用于亚衍射聚焦的宽带高效反射超表面
超振荡现象为实现远场无创超分辨率成像提供了有效的解决方案。然而,大多数超振荡透镜在平衡工作带宽和工作效率方面存在挑战,这极大地限制了超振荡透镜在光学系统中的实际应用。在这项工作中,提出了一种基于反射超表面的亚衍射宽带高效超振荡超透镜,聚焦约0.75倍衍射极限,用于400 ~ 700 nm可见光超分辨成像。此外,还设计了另一种亚衍射聚焦点为衍射极限0.6倍的超构透镜,以证明所提方法的普遍适用性。该方法为显微术、全息术和机器视觉的发展提供了一条有效的途径。
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