Electromagnetic Spin-Orbit Interactions via Scattering of Subwavelength Apertures

Circularly polarized electric fields incident on subwavelength apertures produce near-field phase singularities with phase vorticity +/- 1 depending on the polarization handedness. These near-field phase singularities combine with those associated with orbital angular momentum and result in polarization-dependent transmission. We produce arbitrary phase vorticity in the longitudinal component of scattered electric fields by varying the incident beam and aperture configuration.