Li Xueshen, Chen Shouqian, Wang Di, Shi Xiaotian, Fan Zhigang
Opt Express. 2021 May 24;29(11):17173-17182. doi: 10.1364/OE.424887.
Metasurfaces have shown great potential in versatile areas such as vortex-beam generators, metalenses, holograms and so on. However, chromatic error hinders metasurfaces, especially metalenses, from wider applications. In this paper, we demonstrate a novel design for a transmissive mid-infrared achromatic bifocal metalens with polarization sensitivity. The compensation phase is used to eliminate the chromatic aberration. Simulation results show that, over a continuous waveband from 3.9 to 4.6µm, the focal length only changes by 2.26% with an average focusing efficiency of about 18%. This work can push the practical application of mid-infrared metasurfaces.
超表面在诸如涡旋光束发生器、超透镜、全息图等多个领域展现出了巨大潜力。然而，色差阻碍了超表面，尤其是超透镜的更广泛应用。在本文中，我们展示了一种具有偏振敏感性的透射式中红外消色差双焦超透镜的新颖设计。补偿相位用于消除色差。仿真结果表明，在3.9至4.6μm的连续波段上，焦距仅变化2.26%，平均聚焦效率约为18%。这项工作能够推动中红外超表面的实际应用。
