Hu Jingaowa, Wang Lingjie, Zhao Shangnan, Ye Haokun
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
University of Chinese Academy of Sciences, Beijing 100039, China.
Nanomaterials (Basel). 2023 Sep 5;13(18):2503. doi: 10.3390/nano13182503.
In this paper, a design method of diffraction structure based on metasurface is proposed for light splitting and focusing simultaneously. In the method, firstly, the light field calculation model of the proposed structure is established based on Fresnel diffraction and the transmittance function is calculated. Then, the model structural parameter selection mechanism is determined, and the spectrum resolution equation of the structure is derived. Simulation results indicate that the proposed method can offer a broader working bandwidth and enhanced higher resolution compared to off-axis meta-lens. Moreover, this proposed method can be deployed in high-resolution, wide-band ultra-compact spectrometer systems potentially.
本文提出了一种基于超表面的衍射结构设计方法，可同时实现光的分光和聚焦。该方法中，首先基于菲涅耳衍射建立所提结构的光场计算模型，并计算透过率函数。然后，确定模型结构参数的选择机制，推导该结构的光谱分辨率方程。仿真结果表明，与离轴超透镜相比，所提方法可提供更宽的工作带宽并提高分辨率。此外，该方法有望应用于高分辨率、宽带超紧凑型光谱仪系统。
