Theoretical Analysis of Vector-Vortex Fields Generated by Quasi-Periodic Planar Structure

It was experimentally demonstrated that a circularly polarized plane beam passing through a properly designed quasi-periodic planar structure (qPPS) will be converted into the Bessel-like beam with spiral phase structure. This letter provides the analysis of the vector-vortex field diffracted from the qPPS by performing the rigorous vector diffraction theory. Results demonstrate that a vector-vortex beam can be generated by employing such qPPS, and that its polarization profile can be manipulated by changing elliptically polarized field illuminated onto the qPPS. Results derived in this letter are expected to find potential applications in communication, imaging, etc.