Broadband Stokes parameters reconstruction using ultra-compact metasurfaces

Polarization characterizes the orientational property of an electromagnetic field. It plays an important role in scientific applications ranging from remote sensing to medical diagnostics. In this paper, we propose a novel design of an ultracompact polarimeter, consisting of two ordinary metalenses and a bifocal metalens. Based on the intensities of incident light at four individual points collected by the metasurface, we reconstruct the Stokes parameters via a transformation matrix. Simulation results show that, the root mean square error of each element of the Stokes parameters is less than 0.0064 at the wave band of 1010-1120nm. Therefore, the proposed polarimeter guarantees a high performance in real-time SOP measurements.