pensation, as proved in the previous reports53−55. Addi- tionally, the discernibility in polarization imaging of the proposed polarimeter can be further improved by designing the achromatic metalens with a high numeric- al aperture. The size and numerical aperture of the metalens cannot be balanced due to the limited insuffi- cient phase database. We can address this problem by in- troducing more phase compensation or a topological op- timization method. We would also like to emphasize those functional devices with broadband achromatic, wide-angle, and high numerical aperture can be realized by considering the angular response of the unit cell in conjunction with the framework of recent research in wide-angle imaging, fully accomplishing promising prac- tical applications. This work is expected to achieve much broader application prospects, such as Hartmann-Shack sensors and light field cameras through array arrange- ments. Undoubtedly, the design method of the proposed polarimeter processed the universality and veracity, which can be extended to other wavebands by selected appropriate materials. Conclusion In conclusion, we designed and fabricated a crosstalk- free broadband achromatic full Stokes imaging polari- meter in the infrared regime by integrating six broad- band achromatic dielectric metalenses with polarization- sensitive responses. Simulated and experimental results demonstrate that the proposed polarimetry exhibits ex- cellent achromatic performan
Source PDF · page 12RESEARCH PAPER
Crosstalk-free achromatic full Stokes imaging polarimetry metasurface enabled by polarization-dependent phase optimization
Yaxin Zhang, Mingbo Pu, Jinjin Jin, Xinjian Lu, Yinghui Guo, Jixiang Cai, Fei Zhang, Yingli Ha, Qiong He, Mingfeng Xu, Xiong Li, Xiaoliang Ma, Xiangang Luo
Research context
Imaging polarimetry is one of the most widely used analytical technologies for object detection and analysis. To date, most metasurface-based polarimetry techniques are severely limited by narrow operating bandwidths and inevitable crosstalk, leading to detrimental effects on imaging quality and measurement accuracy. Here, we propose a crosstalk-free broadband achromatic full Stokes imaging polarimeter consisting of polarization-sensitive dielectric metalenses, implemented by the principle of polarization-dependent phase optimization. Compared with the single-polarization optimization method, the average crosstalk has been reduced over three times under incident light with arbitrary polarization ranging from 9 μm to 12 μm, which guarantees the measurement of the polarization state more precisely. The experimental results indicate that the designed polarization-sensitive metalenses can effectively eliminate the chromatic aberration with polarization selectivity and negligible crosstalk. The measured average relative errors are 7.08%, 8.62%, 7.15%, and 7.59% at 9.3, 9.6, 10.3, and 10.6 μm, respectively. Simultaneously, the broadband full polarization imaging capability of the device
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Yaxin Zhang, Mingbo Pu, Jinjin Jin, Xinjian Lu, Yinghui Guo, Jixiang Cai, Fei Zhang, Yingli Ha, Qiong He, Mingfeng Xu, Xiong Li, Xiaoliang Ma, Xiangang Luo. Crosstalk-free achromatic full Stokes imaging polarimetry metasurface enabled by polarization-dependent phase optimization. Opto-Electronic Advances (2022). https://doi.org/10.29026/oea.2022.220058
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