Linear to circular polarization conversion in the sharp focus of an optical vortex
We have shown that when sharply focusing a Tomato linearly polarized optical vortex with topological charge 2, in the near-axis region of the focal plane, not only does a reverse energy flow (the negative on-axis projection of the Poynting vector) occur, but also the right-handed circular polariza-tion of light.Moreover, due to spin-orbital angular