Wang Yilin, Zhang Song, Liu Mingze, Huo Pengcheng, Tan Le, Xu Ting
Opt Lett. 2023 Sep 1;48(17):4709-4712. doi: 10.1364/OL.499942.
Metasurfaces have recently emerged as a crucial tool because they achieve spherical-aberration-free focusing when exposed to normal incident light. Nevertheless, these metasurfaces often exhibit considerable coma when subjected to oblique incident light, thereby limiting their imaging field of view. In light of this, our study presents the design and an experimental demonstration of a polarization-insensitive, large-field-of-view metalens that uses a silicon metasurface. The metalens is specifically tailored to the long-wavelength infrared region and possesses a numerical aperture of 0.81, which is capable of focusing light at incident angles up to ±80°. Moreover, we successfully build a meta-optics camera by integrating the large field-of-view metalens on top of an image sensor, thus enabling wide-angle thermal imaging of practical scenes. This research provides new, to the best of our knowledge, insights for designing and realizing large-field-of-view optical systems and holds promise for applications in night vision imaging and security monitoring.
超表面最近已成为一种关键工具，因为当暴露于垂直入射光时，它们能够实现无球差聚焦。然而，当这些超表面受到斜入射光照射时，它们通常会表现出相当大的彗差，从而限制了它们的成像视野。有鉴于此，我们的研究提出了一种使用硅超表面的偏振不敏感、大视野金属透镜的设计及实验演示。该金属透镜专为长波长红外区域量身定制，数值孔径为0.81，能够在高达±80°的入射角下聚焦光线。此外，我们通过将大视野金属透镜集成在图像传感器顶部，成功构建了一台超光学相机，从而实现了实际场景的广角热成像。据我们所知，这项研究为设计和实现大视野光学系统提供了新的见解，并有望应用于夜视成像和安全监控领域。
