具有亚衍射极限和多功能聚焦的反射式超透镜

Reflective metalens with sub-diffraction-limited and multifunctional focusing.

作者信息

Yang Hui, Li Guanhai, Su Xiaofang, Cao Guangtao, Zhao Zengyue, Chen Xiaoshuang, Lu Wei

机构信息

National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai, 200083, China.

University of Chinese Academy of Science, No.19A Yuquan Road, Beijing, 100049, China.

出版信息

Sci Rep. 2017 Oct 3;7(1):12632. doi: 10.1038/s41598-017-13004-z.

DOI:10.1038/s41598-017-13004-z

PMID:28974719

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5626731/

Abstract

We propose an ultra-thin planar reflective metalens with sub-diffraction-limited and multifunctional focusing. Based on the equal optical path principle, the specific phase distributions for multifunction focusing are derived. Following the formulas, on-center focusing with the characteristics of sub-diffraction-limited, high focusing efficiency (85%) and broadband focusing is investigated in detail. To demonstrate the flexibility of the reflective metalens, off-center and dual spots focusing (at the horizontal and longitudinal directions) are demonstrated. Note that all these focusings are sub-diffraction-limited due to the evanescent-filed enhancement mechanism in our elaborately designed structure. The designed reflective metalens will find important applications in super-resolution imaging, microscopes, and spectroscopic designs.

摘要

我们提出了一种具有亚衍射极限和多功能聚焦的超薄平面反射式超颖透镜。基于等光程原理，推导了多功能聚焦的特定相位分布。根据这些公式，详细研究了具有亚衍射极限特性、高聚焦效率（85%）和宽带聚焦的中心聚焦。为了展示反射式超颖透镜的灵活性，还展示了离轴和双点聚焦（在水平和纵向方向）。需要注意的是，由于我们精心设计的结构中的倏逝场增强机制，所有这些聚焦都是亚衍射极限的。所设计的反射式超颖透镜将在超分辨率成像、显微镜和光谱设计中找到重要应用。