Figure 4.

(a) The angle between the Stokes eigenvectors $\widehat{\mathbf{\text{A}}}$ and $\widehat{\mathbf{\text{B}}}$ is equal to the covertex angle of the elliptic FoV. (b) The geometric Pancharatnam-Berry phase introduced by the Jones matrix is the angular opening of the smallest angular sector of the complex plane anchored at the origin by the ellipse, i.e. ψ_G = ψ_max − ψ_min. (Online version in colour.)