论文标题
超紧凑型单件金属的计算逆设计，没有色差和角度畸变
Computational inverse design for ultra-compact single-piece metalenses free of chromatic and angular aberration
论文作者
论文摘要
我们介绍了单件多层金属蛋白的全麦克韦拓扑优化设计，约10个波长〜$λ$的厚度，同时集中在$ 60^\ circ $ circular范围和23 \％的光谱带宽，而无需遭受色素或角度的色素差异，而是“ plan-charromat”。它在所有角度和频率上都达到了衍射限制的聚焦（Strehl比率$> 0.8 $）和绝对聚焦效率$> 50 $ \％。列出了2D和3D Axi对称设计，在$ \ sim 10^5 $自由度上进行了优化。我们还展示了缩短镜头对传感器距离的同时，同时产生与更长的“虚拟”焦距并保持计划相同性的图像。这些概念验证设计表明，可以通过利用次波长度设计的完整波形物理学来实现超紧凑的多功能性，并激励未来的多层元元观点设计和制造工作。
We present full-Maxwell topology-optimization design of a single-piece multlayer metalens, about 10 wavelengths~$λ$ in thickness, that simultaneously focuses over a $60^\circ$ angular range and a 23\% spectral bandwidth without suffering chromatic or angular aberration, a "plan-achromat." At all angles and frequencies it achieves diffraction-limited focusing (Strehl ratio $> 0.8$) and absolute focusing efficiency $> 50$\%. Both 2D and 3D axi-symmetric designs are presented, optimized over $\sim 10^5$ degrees of freedom. We also demonstrate shortening the lens-to-sensor distance while producing the same image as for a longer "virtual" focal length and maintaining plan-achromaticity. These proof-of-concept designs demonstrate the ultra-compact multi-functionality that can be achieved by exploiting the full wave physics of subwavelength designs, and motivate future work on design and fabrication of multi-layer meta-optics.
