Fig. 4
From: Computational spectropolarimetry with a tunable liquid crystal metasurface
Experimental spectropolarimetric reconstruction. a Photograph (upper panel) and SEM image (lower panel) of the fabricated liquid crystal metasurface. b Experimental setup for the Mueller matrix calibration and spectropolarimetric measurements. c Calibrated rx, ry, and Δφ as functions of V in the wavelength range from 1420 to 1470 nm. d Comparison of reconstructed wavelengths (orange dots) of monochromatic incident light (from 1420 to 1470 nm, with 1 nm separation) with the ground truth (blue line). e Comparison of reconstructed polarization states (dashed lines) of monochromatic incident light and the ground truth (solid lines). f Comparison between the experimentally reconstructed spectrum (upper panel) and Stokes parameters (lower panel) and the ground truth for a narrowband input signal. Dashed and solid lines in the inset of the upper panel represent the reconstructed polarization state and the ground truth, respectively. g Experimentally measured switch-on and switch-off time of the liquid crystal metasurface, respectively. Blue and red lines represent the measured reflectance and the voltage applied to the metasurface as a function of time, respectively