Hu Yueqiang, Jiang Yuting, Zhang Yi, Yang Xing, Ou Xiangnian, Li Ling, Kong Xianghong, Liu Xingsi, Qiu Cheng-Wei, Duan Huigao
National Research Center for High-Efficiency Grinding, College of Mechanical and Vehicle Engineering, Hunan University, Changsha, 410082, PR China.
Advanced Manufacturing Laboratory of Micro-Nano Optical Devices, Shenzhen Research Institute, Hunan University, Shenzhen, 518000, PR China.
Nat Commun. 2023 Oct 20;14(1):6649. doi: 10.1038/s41467-023-42268-5.
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.
色散将复合光分解为其单色成分，这对宽带成像不利，但对光谱应用有利。超表面提供了一条独特的途径，可通过在二维平面上调整结构参数来调制色散。然而，传统的线性相位补偿无法使超单元的色散特性与所需的复色散充分匹配，尤其在非常宽的带宽上阻碍了随意的色散工程。在此，我们提出一种用于超宽带色散控制超透镜的渐近相位补偿策略。已经制造出具有极高纵横比纳米结构的超表面，用于超宽带中的任意色散控制，并且我们通过实验证明了在可见到红外光谱（400nm~1000nm，NA = 0.164）中的单层消色差超透镜。我们提出的方案为单层超光学提供了一个全面的理论框架，允许在无带宽限制的情况下进行任意色散操纵。这一进展预计在超宽带成像和色谱检测等方面有重要应用。
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