Hu Yueqiang, Jiang Yuting, Zhang Yi, Wang Quan, Pan Meiyan, Duan Huigao
National Research Center for High-Efficiency Grinding, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, P.R. China.
Greater Bay Area Institute for Innovation, Hunan University, Guangzhou, 511300, Guangdong Province, China.
Nano Lett. 2024 Oct 3. doi: 10.1021/acs.nanolett.4c03785.
Metasurfaces provide an ultrathin platform for compact, real-time polarimetry. However, their applications in polychromatic scenes are restricted by narrow operating bandwidths that causes spectral information loss. Here, we demonstrate full-color polarization imaging using an achromatic polarimeter consisting of four polarization-dependent metalenses. Leveraging an intelligent design scheme, we achieve effective arbitrary phase compensation and multiobjective matching with a limited database. This system provides broadband achromaticity across wavelengths from 450 to 650 nm, resulting in a relative bandwidth of approximately 0.364 for full Stokes imaging. Experimental reconstruction errors for wavelengths of 450, 550, and 650 nm are 7.5%, 5.9%, and 3.8%, respectively. Performance is evaluated based on both achromatic bandwidth and crosstalk, with our design achieving three times the performance of the current state-of-the-art. The full-color, full-polarization imaging capability of the device is further validated with a customized object. The proposed scheme advances polarization imaging for practical applications.
超表面为紧凑、实时的偏振测量提供了一个超薄平台。然而，它们在多色场景中的应用受到窄工作带宽的限制，这会导致光谱信息丢失。在此，我们展示了使用由四个偏振依赖型超透镜组成的消色差偏振计进行全彩色偏振成像。利用一种智能设计方案，我们在有限的数据库下实现了有效的任意相位补偿和多目标匹配。该系统在450至650纳米的波长范围内提供宽带消色差，全斯托克斯成像的相对带宽约为0.364。450、550和650纳米波长的实验重建误差分别为7.5%、5.9%和3.8%。基于消色差带宽和串扰对性能进行了评估，我们的设计实现了当前最先进技术性能的三倍。该设备的全彩色、全偏振成像能力通过一个定制物体得到了进一步验证。所提出的方案推动了偏振成像在实际应用中的发展。
