Optimal configuration of static polarization imagers for target detection

We determine the set of analysis states of a static Stokes imager that maximizes target detection performance for the least favorable target-background polarimetric configuration. By using a minimax approach, we demonstrate that the optimal choice consists of four analysis states forming a regular tetrahedron in the Poincare sphere. We also show that the value of the contrast in the best of the four Stokes channels is, in the worst case, equal to one third of that provided by a fully adaptive polarimetric imager. Static Stokes imagers thus constitute an attractive solution in applications where limited loss of discrimination ability can be tolerated. (C) 2015 Optical Society of America