Open AccessSuper-oscillatory metasurface doublet for sub-diffraction focusing with a large incident angle
Author(s) -
Zhu Li,
Changtao Wang,
Yanqin Wang,
Xinya Lu,
Yinghui Guo,
Xiong Li,
Xiaoliang Ma,
Mingbo Pu,
Xiangang Luo
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.417884
Subject(s) - diffraction , optics , nanopillar , physics , interference (communication) , ray , near and far field , near field optics , diffraction efficiency , resolution (logic) , materials science , optical microscope , nanostructure , scanning electron microscope , channel (broadcasting) , electrical engineering , quantum mechanics , artificial intelligence , computer science , engineering
Based on the delicate interference behavior of light in the far field, the optical super-oscillatory phenomenon has been successfully applied in non-invasive sub-diffraction focusing and super-resolution imaging in recent years. However, the optical super-oscillatory field is particularly sensitive to the change of incident angle, leading to a limited field of view for super-resolution imaging. In this paper, a super-oscillatory metasurface doublet is proposed to achieve far-field sub-diffraction focusing with an incident angle of up to 25°. The constructed doublet, consisting of high-aspect-ratio rectangular nanopillars with high efficiency, is further demonstrated through a full-wave simulation, and the numerical results indicate that the sub-diffraction foci with about 0.75 times of the diffraction limit is achieved for different incident angles. The proposed super-oscillatory metasurface doublet may find intriguing applications in label-free super-resolution microscopy and optical precise fabrication.