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10.3390/nano12234298
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Article

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

by
Ruixue Shi
1,
Shuling Hu
1,*,
Chuanqi Sun
1,
Bin Wang
2,* and
Qingzhong Cai
1
1
School of Instrumentation and Optoelectronics Engineering, Beihang University, Beijing 100191, China
2
Institute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2022, 12(23), 4298; https://doi.org/10.3390/nano12234298
Submission received: 25 October 2022 / Revised: 27 November 2022 / Accepted: 30 November 2022 / Published: 3 December 2022
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Abstract

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.
Keywords: achromatic broadband metalens; Fresnel zone spatial multiplexing; particle swarm algorithm achromatic broadband metalens; Fresnel zone spatial multiplexing; particle swarm algorithm

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MDPI and ACS Style

Shi, R.; Hu, S.; Sun, C.; Wang, B.; Cai, Q. Broadband Achromatic Metalens in the Visible Light Spectrum Based on Fresnel Zone Spatial Multiplexing. Nanomaterials 2022, 12, 4298. https://doi.org/10.3390/nano12234298

AMA Style

Shi R, Hu S, Sun C, Wang B, Cai Q. Broadband Achromatic Metalens in the Visible Light Spectrum Based on Fresnel Zone Spatial Multiplexing. Nanomaterials. 2022; 12(23):4298. https://doi.org/10.3390/nano12234298

Chicago/Turabian Style

Shi, Ruixue, Shuling Hu, Chuanqi Sun, Bin Wang, and Qingzhong Cai. 2022. "Broadband Achromatic Metalens in the Visible Light Spectrum Based on Fresnel Zone Spatial Multiplexing" Nanomaterials 12, no. 23: 4298. https://doi.org/10.3390/nano12234298

APA Style

Shi, R., Hu, S., Sun, C., Wang, B., & Cai, Q. (2022). Broadband Achromatic Metalens in the Visible Light Spectrum Based on Fresnel Zone Spatial Multiplexing. Nanomaterials, 12(23), 4298. https://doi.org/10.3390/nano12234298

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