Zhao Fen, Zhao Changchun, Zhang Yuqing, Chen Jie, Li Shaoqi, Zhou Wangzhe, Ran Chongchong, Zeng Yongcan, Chen Huan, He Xin, Wu Jiagui, Zhu Gangyi, Yang Junbo
College of Science, National University of Defense Technology, Changsha 410073, China.
School of Artificial Intelligence, Chongqing University of Technology, Chongqing 401135, China.
Nanophotonics. 2025 Mar 13;14(5):589-599. doi: 10.1515/nanoph-2024-0716. eCollection 2025 Mar.
Metalens has shown its significantly ultra-light and ultra-thin features. However, large-aperture achromatic metalens is constrained by both maximum dispersion range and computational memory. Here, we propose a fully device optimizing framework that engineers phase dispersion and amplitude transmittance to create centimeter-size achromatic metalens operating in long-wave infrared regime (8-12 μm). Via wrapping group delay within a defined range and optimizing dispersion phase of desired wavelengths, chromatic aberrations can be effectively corrected. We verify our design by characterizing all-silicon 3.18-cm-diameter and 6.36-cm-diameter LWIR achromatic metalenses. Diffraction-limited tight-focusing can be achieved, and the normalized focal length shift is less than 3.3 × 10. Thermal imaging performance is verified on targets of holes or letters with a diameter or line width exceeding 2 mm. These findings facilitate the development of large-aperture achromatic metalenses and open up possibilities for lightweight imaging systems in long-wave infrared.
超颖透镜已展现出其显著的超轻超薄特性。然而，大口径消色差超颖透镜受到最大色散范围和计算内存的限制。在此，我们提出了一个完整的器件优化框架，通过设计相位色散和振幅透过率来制造工作在长波红外波段（8 - 12微米）的厘米级消色差超颖透镜。通过将群延迟限制在一定范围内并优化所需波长的色散相位，可以有效校正色差。我们通过对全硅材质、直径分别为3.18厘米和6.36厘米的长波红外消色差超颖透镜进行表征来验证我们的设计。可以实现衍射极限紧密聚焦，归一化焦距偏移小于3.3×10。在直径或线宽超过2毫米的孔洞或字母目标上验证了热成像性能。这些发现推动了大口径消色差超颖透镜的发展，并为长波红外领域的轻量级成像系统开辟了可能性。
