These matrices indeed satisfy the chirality criteria of equation (1) within the ∼ 1% uncer- tainty evaluated from the degree of purity of the Mueller matrice of the empty setup. To illustrate the polarization conversion properties of our chiral structures, we compare in Fig. 2 theory and experiment when the input state is linearly polarized and when the output transmitted intensity is analyzed along different orthogonal directions. A good agreement between the measurements and the theoretical predictions deduced from the Jones matri- 6 III. DISCUSSION AND CONCLUSION FIG. 2: Analysis of the polarization states for an input light with variable linear polarization for both the left (left panel) and right handed (right panel) individual chiral structures of Fig. 1. The data points (acquired with a laser light at λ = 780 nm) are compared to the predictions from equation (2) (continuous curves) for respectively the transmitted intensity analyzed along the direction: | x 〉 (green), | y 〉 (yellow), | + 45 $^{◦}$〉 (cyan), | − 45 $^{◦}$〉 (magenta), | L 〉 (red), and | R 〉 (blue). The total transmitted intensity is also shown (black). The symmetries between both panel expected from group theory (see appendix D) are observed experimentally. The insets show in each panel the ellipses of polarization and the handedness (arrow) associated with the two corotating eingenstates associated with the Jones matrix J L (blue) and J R (red).