Fig. 2: Realized PS trajectory encoding metasurface for histogram stretching capability.
From: Poincaré sphere trajectory encoding metasurfaces based on generalized Malus’ law
a The designed spiral trajectory governed by analytical function \({\psi }_{l}=2{\cos }^{2}({\chi }_{l}-\pi /4)\) under the circular basis on the PS; (b) Histogram transform curves at analyzer states 1: north pole (ψA = 0o, χA = 45o), 2: south pole (ψA = 0o, χA=−45o), and 3: (ψA = 135o, χA = 35o); (c–e) Decoded images and their transformed histograms at the analyzer states 1, 2, 3 respectively.
