期刊
OPTICS EXPRESS
卷 29, 期 7, 页码 9991-9999出版社
Optica Publishing Group
DOI: 10.1364/OE.417884
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类别
资金
- National Natural Science Foundation of China [61675207, 61875253, 61905073]
This paper presents a design of a super-oscillatory metasurface doublet capable of achieving sub-diffraction focusing at high incident angles in the far field, with high efficiency and supporting numerical results. This technology may have potential applications in label-free super-resolution microscopy and optical precise fabrication.
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 degrees. 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. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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