【摘要】 为扩展超透镜的设计自由度，实现多功能的超透镜，并降低超表面器件的设计难度，提出一种基于梯度下降优化的超透镜逆向方法。结合反向传播算法求解梯度信息，实现了偏振不敏感的基于单层结构的消色差多阶超透镜设计。利用双光子聚合3D打印技术，对加工工艺进行探索，实现了打印横向分辨率达到200 nm的超透镜加工。实验测量到所加工的超透镜的焦距和设计值偏离小于3%。对比其他报道，该研究结合了逆向设计方法的设计灵活性和双光子聚合3D打印方法的三维加工优势，为超表面的高自由度设计和加工提供了新的思路，不仅充分发挥了超表面的光场调控优势，还推进了其工程应用。更多还原

【Abstract】 To expand the design freedom of metalenses, realize multifunctional metalenses, and reduce the design difficulty of metasurface devices, an inverse method based on gradient-descent optimization is proposed. Combined with the backpropagation algorithm to solve the gradient information, the polarization-insensitive achromatic metalens design based on a single-layer structure is realized. Using two-photon polymerization three-dimensional(3D) printing technology, the processing technology was investigated, and a metalens with a lateral resolution of 200 nm was processed. Experimental results revealed that the focal length of the processed metalens deviated from the design value by less than 3%. Compared with other studies, this study combines the design flexibility of the inverse design method with the 3D processing advantages of the two-photon polymerization 3D printing method. As such, a new solution for designing and processing highdegree-of-freedom metasurfaces is provided by fully exploiting the advantages of light field control of metasurfaces, thereby promoting the engineering application of metasurfaces.更多还原