Electrically tunable generation of inhomogeneously polarized light beam

We propose a method for generating inhomogeneously polarized light beams using two conjugated electro-optic spiral phase plates and a quarter-wave-plate (QWP). By changing the incident homogeneous polarization state, we can obtain all the states on a higher-order Poincaré sphere (PS). The order m of PS can be an integer or a non-integer, and is electrically tunable. Without the QWP, hybridly polarized vector beams with spatially variant spin angular momentum can be created.