Asymptotic dispersion engineering for ultra-broadband meta-optics

Yueqiang Hu, Yuting Jiang, Yi Zhang, Xing Yang, Xiangnian Ou, Ling Li, Xianghong Kong, Xingsi Liu, Cheng-Wei Qiu () and Huigao Duan ()
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Yueqiang Hu: Hunan University
Yuting Jiang: Hunan University
Yi Zhang: Hunan University
Xing Yang: Hunan University
Xiangnian Ou: Hunan University
Ling Li: Hunan University
Xianghong Kong: National University of Singapore
Xingsi Liu: National University of Singapore
Cheng-Wei Qiu: National University of Singapore
Huigao Duan: Hunan University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Dispersion decomposes compound light into its monochromatic components, which is detrimental to broadband imaging but advantageous for spectroscopic applications. Metasurfaces provide a unique path to modulate the dispersion by adjusting structural parameters on a two-dimensional plane. However, conventional linear phase compensation does not adequately match the meta-unit’s dispersion characteristics with required complex dispersion, hindering at-will dispersion engineering over a very wide bandwidth particularly. Here, we propose an asymptotic phase compensation strategy for ultra-broadband dispersion-controlled metalenses. Metasurfaces with extraordinarily high aspect ratio nanostructures have been fabricated for arbitrary dispersion control in ultra-broad bandwidth, and we experimentally demonstrate the single-layer achromatic metalenses in the visible to infrared spectrum (400 nm~1000 nm, NA = 0.164). Our proposed scheme provides a comprehensive theoretical framework for single-layer meta-optics, allowing for arbitrary dispersion manipulation without bandwidth restrictions. This development is expected to have significant applications in ultra-broadband imaging and chromatography detection, among others.

Date: 2023
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DOI: 10.1038/s41467-023-42268-5

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