A super-oscillatory step-zoom metalens for visible light

In recent years, the super-oscillation method based on the fine interference of optical fields has been successfully applied to sub-diffraction focusing and super-resolution imaging. However, most previously reported works only describe static super-oscillatory lenses. Super-oscillatory lenses using...

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Bibliographic Details
Published inBeilstein journal of nanotechnology Vol. 13; no. 1; pp. 1220 - 1227
Main Authors Zhou, Yi, Yan, Chao, Tian, Peng, Li, Zhu, He, Yu, Fan, Bin, Wang, Zhiyong, Deng, Yao, Tang, Dongliang
Format Journal Article
LanguageEnglish
Published Frankfurt am Main Beilstein-Institut zur Föerderung der Chemischen Wissenschaften 28.10.2022
Beilstein-Institut
Subjects
Design
Efficiency
Full Research Paper
geometric phase
Glass substrates
Image resolution
Light
Microscopy
Nanoscience
Nanotechnology
Optics
Phase change materials
phase-change material
Precision machining
step-zoom lens
super-oscillatory
Wave diffraction
Zoom lenses
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Summary:In recent years, the super-oscillation method based on the fine interference of optical fields has been successfully applied to sub-diffraction focusing and super-resolution imaging. However, most previously reported works only describe static super-oscillatory lenses. Super-oscillatory lenses using phase-change materials still have issues regarding dynamic tunability and inflexibility. Therefore, it is vital to develop a flexible and tunable modulation approach for super-oscillatory lenses. In this paper, we propose a super-oscillatory step-zoom lens based on the geometric phase principle, which can switch between two focal lengths within a certain field of view. The designed device consists of nanopillars with high efficiency of up to 80%, and the super-resolution focusing with 0.84 times of diffraction limit is verified by the full-wave simulation. The proposed method bears the potential to become a useful tool for label-free super-resolution microscopic imaging and optical precision machining.
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ISSN:2190-4286
2190-4286
DOI:10.3762/bjnano.13.101