Li Junwei, Wang Yilin, Liu Shengjie, Xu Ting, Wei Kai, Zhang Yudong, Cui Hao
Opt Express. 2022 Aug 1;30(16):28882-28891. doi: 10.1364/OE.462251.
Because of unique superiorities of planar optical devices based on metalens on manipulating amplitude, phase, polarization, wavelength of incident light, metalenses have great prospects to replace traditional catadioptric optical components, especially in imaging and optoelectronic integration. However, the research of metalens has focused on visible or near-infrared wavelength in the past few years and little attention was paid to the long-wavelength infrared metalens. Here, we demonstrate the largest aperture, high numerical aperture, and polarization-independent metalens operating at long-wavelength infrared. The metalens has a numerical aperture of 0.45 at the center wavelength of10 µm. The aperture of the metalens is 80 mmwhich is much larger than the existing level we know. It has high-resolution imaging ability with focusing incident light down to a spot as small as ∼1.04λ. Ambient light imaging experiments are carried out to show the performance of the metalens. In addition, metalens is flimsy, large-scale and low-cost, which provides an effective solution for the development of ultra-lightweight and compact optical devices for LWIR technology.
由于基于超表面的平面光学器件在操纵入射光的振幅、相位、偏振和波长方面具有独特优势，超表面在取代传统折反射光学元件方面具有广阔前景，尤其是在成像和光电集成领域。然而，在过去几年中，超表面的研究主要集中在可见光或近红外波长，对长波长红外超表面关注较少。在此，我们展示了工作在长波长红外波段的最大孔径、高数值孔径且与偏振无关的超表面。该超表面在中心波长10 µm处的数值孔径为0.45。超表面的孔径为80 mm，远大于我们所知的现有水平。它具有高分辨率成像能力，能将入射光聚焦到小至约1.04λ的光斑。进行了环境光成像实验以展示超表面的性能。此外，超表面轻薄、可大规模制造且成本低，为长波红外技术中超轻量、紧凑型光学器件的发展提供了有效解决方案。
