Metasurfaces are a novel class of artificial materials that are composed of two-dimensional arrays of subwavelength-structured elements with unique and highly controllable electromagnetic properties. By exploiting the birefringence response, metasurfaces can serve as multifunctional free-space polarization optics. Among these, metasurface gratings are particularly innovative polarimetric components that integrate multiple polarization analyzers into a single optical element, enabling the realization of compact imaging polarimeters. However, to fully leverage the potential of metasurfaces as a new building block for polarization optics, it is essential to calibrate the optical systems based on metagratings. In this paper, Lisa W. Li, Noah A. Rubin, and colleagues present a detailed comparison of a prototype metasurface full-Stokes imaging polarimeter to a benchtop reference instrument using an established linear Stokes test for three metagratings working at different visible frequencies. Additionally, the paper proposes a complementary full-Stokes accuracy test and demonstrates its efficacy using the 532 nm grating. This work outlines the methods and practical considerations required to generate accurate polarization data from a metasurface-based Stokes imaging polarimeter, providing valuable insights for their implementation in polarimetric systems more broadly.

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