Broadband Achromatic Metalens in the Visible Light Spectrum Based on Fresnel Zone Spatial Multiplexing

Metalenses composed of a large number of subwavelength nanostructures provide the possibility for the miniaturization and integration of the optical system. Broadband polarization-insensitive achromatic metalenses in the visible light spectrum have attracted researchers because of their wide applica...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-12, Vol.12 (23), p.4298
Main Authors: Shi, Ruixue, Hu, Shuling, Sun, Chuanqi, Wang, Bin, Cai, Qingzhong
Format: Article
Language:English
Subjects:
achromatic broadband metalens
Achromatic devices
Algorithms
Analysis
Bandwidths
Broadband
Cameras
Design
Fresnel zone spatial multiplexing
Fresnel zones
Glass substrates
Libraries
Light
Methods
Miniaturization
Multiplexing
Optimization
particle swarm algorithm
Polarization
Polarization (Light)
Propagation
Silicon nitride
Spectrum allocation
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Summary:Metalenses composed of a large number of subwavelength nanostructures provide the possibility for the miniaturization and integration of the optical system. Broadband polarization-insensitive achromatic metalenses in the visible light spectrum have attracted researchers because of their wide applications in optical integrated imaging. This paper proposes a polarization-insensitive achromatic metalens operating over a continuous bandwidth from 470 nm to 700 nm. The silicon nitride nanopillars of 488 nm and 632.8 nm are interleaved by Fresnel zone spatial multiplexing method, and the particle swarm algorithm is used to optimize the phase compensation. The maximum time-bandwidth product in the phase library is 17.63. The designed focal length can be maintained in the visible light range from 470 nm to 700 nm. The average focusing efficiency reaches 31.71%. The metalens can achieve broadband achromatization using only one shape of nanopillar, which is simple in design and easy to fabricate. The proposed metalens is expected to play an important role in microscopic imaging, cameras, and other fields.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12234298