Superoscillation metalenses have demonstrated promising prospects in breaking the theoretical diffraction limitations on the resolution of optical devices and systems. However, most reported superoscillation metalenses have a very small field of view of several tenths of a degree, which greatly limits their applications in imaging and microscopy. Therefore, it is of critical importance to achieve absolute high resolution by increasing the numerical apertures (NAs) of optical devices and systems. Unfortunately, similar to the case in traditional optics, it is challenging to realize a large field of view at high NA, especially in the superoscillation regime. To date, no attempt has been made to achieve flat-field focusing in the superoscillation regime, to our knowledge. Here, we demonstrate a high-NA superoscillation metalens with an entrance aperture stop, which is optimized for superoscillation performance with a comparatively large field of view. The proposed flat-field superoscillation metalens has an effective NA as large as 0.89 and achieves superoscillation focusing within a field of view of 9°. Such a superoscillation metalens may offer a promising way toward superoscillation imaging and fast-scanning label-free far-field superoscillation microscopy.

Dingpeng Liao;Fengliang Dong;Kun Zhang;Yi Zhou;Gaofeng Liang;Zhihai Zhang;Zhongquan Wen;Zhengguo Shang;Gang Chen;Luru Dai;Weiguo Chu

Key Laboratory of Optoelectronic Technology & Systems (Chongqing University), Ministry of Education, and College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China;National Center for Nanoscience and Technology, Beijing 100190, China;e-mail: dai@nanoctr.cn;e-mail: wgchu@nanoctr.cn

光子学研究（英文）

[1]Dingpeng Liao;Fengliang Dong;Kun Zhang;Yi Zhou;Gaofeng Liang;Zhihai Zhang;Zhongquan Wen;Zhengguo Shang;Gang Chen;Luru Dai;Weiguo Chu-.Flat-field superoscillation metalens)[J].光子学研究（英文）,2022(08):1924

superoscillation,Superoscillation,tenths

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