Liu Yiyang, Zhang Qiangbo, Zhang Changwei, Wang Mengguang, Zheng Zhenrong
College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Nanomaterials (Basel). 2025 Jul 5;15(13):1046. doi: 10.3390/nano15131046.
Optical systems with wide field-of-view (FOV) imaging capabilities are crucial for applications ranging from biomedical diagnostics to remote sensing, yet conventional wide-angle optics face integration challenges in compact platforms. Here, we present the design and experimental demonstration of a single-layer silicon carbide (SiC) metalens achieving a 90° total FOV, whose planar structure and small footprint address the challenges. This design is driven by a gradient-based numerical optimization strategy, Gradient-Optimized Phase Profile Shaping (GOPP), which optimizes the phase profile to accommodate the angle-dependent requirements. Combined with a front aperture, the GOPP-generated phase profile enables off-axis aberration control within a planar structure. Operating at 803 nm with a focal length of 1 mm (NA = 0.25), the fabricated metalens demonstrated focusing capabilities across the wide FOV, enabling effective wide-angle imaging. This work demonstrates the feasibility of using numerical optimization to realize single-layer metalens with challenging wide FOV capabilities, offering a promising route towards highly compact imagers for applications such as endoscopy and dermoscopy.
具有宽视场（FOV）成像能力的光学系统对于从生物医学诊断到遥感等一系列应用至关重要，然而传统的广角光学器件在紧凑平台上面临集成挑战。在此，我们展示了一种实现90°总视场的单层碳化硅（SiC）超表面透镜的设计与实验演示，其平面结构和小尺寸解决了这些挑战。该设计由基于梯度的数值优化策略——梯度优化相位轮廓整形（GOPP）驱动，该策略优化相位轮廓以适应与角度相关的要求。结合前孔径，GOPP生成的相位轮廓能够在平面结构内控制离轴像差。所制备的超表面透镜在803 nm波长下工作，焦距为1 mm（数值孔径=0.25），展示了在宽视场内的聚焦能力，实现了有效的广角成像。这项工作证明了使用数值优化来实现具有挑战性的宽视场能力的单层超表面透镜的可行性，为诸如内窥镜检查和皮肤镜检查等应用的高度紧凑成像仪提供了一条有前景的途径。
