Comparison of backward flow values in the sharp focus of light fields with polarization and phase singularity
Kotlyar V.V., Nalimov A.G., Stafeev S.S.

 

IPSI RAS – Branch of the FSRC “Crystallography and Photonics” RAS, Molodogvardeyskaya 151, 443001, Samara, Russia;
Samara National Research University, Moskovskoye shosse, 34, 443086, Samara, Russia

Abstract:
Using Jones matrices and vectors, we show that an optical metasurface composed of a set of subwavelength binary diffraction gratings and characterized by an anisotropic transmittance described by a polarization rotation matrix by the angle mφ, where φ is the polar angle, forms an m-th order azimuthally or radially polarized beam when illuminated by linearly polarized light, generating an optical vortex with the topological charge m upon illumination by circularly polarized light. Such a polarization-phase converter (PPC) performs a spin-orbit transformation, similar to that performed by liquid-crystal q-plates. Using a FDTD method, it is numerically shown that when illuminating the PPC by a uniformly (linearly or circularly) polarized field with topological charge m = 2 and then focusing the output beam with a binary zone plate, a reverse on-axis light flow is formed, being comparable in magnitude with the direct optical flow. Moreover, the reverse flows obtained when focusing the circularly polarized optical vortex with the topological charge m = 2 and the second-order polarization vortex are shown to be the same in magnitude.

Keywords:
optical vortex, polarization, backward flux, metalens.

Citation:
Kotlyar VV, Nalimov AG, Stafeev SS. Comparison of backward flow values in the sharp focus of light fields with polarization and phase singularity. Computer Optics 2019; 43(2): 174-183. DOI: 10.18287/2412-6179-2019-43-2-174-183.

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