Fig. 3.

Experimental validation of polarimetry with only one pixel of the metalens array. a–f Measured images of the resulting focal spots for incident horizontal or vertical linear polarization (“x” and “y”), diagonal linear polarization (“a” and “b”), and circular polarization (“l” and “r”). Scale bars: 10 μm. g Poincaré sphere comparing the theoretical (small circles) and the experimentally reconstructed (stars) Stokes parameters s₁, s₂, and s₃. For each of the three different colors (red, blue, black), one Stokes parameter is zero