Enhancement of Optical Spin-Orbit Coupling in Anisotropic ENZ Metamaterials

Vector vortex beams which possess complex intensity and polarisation patterns, phase or singularities are important in a variety of applications ranging from high resolution imaging data transmission to nonlinear optics quantum technologies. Here, we theoretically analyse the effect vector propagation through strongly anisotropic metamaterials exhibiting epsilon-near-zero behaviour. The interaction metamaterial with longitudinal field results strong modification distribution, acting as an azimuthal polariser. dependence on local ellipticity is also investigated revealing conversion spin angular momentum orbital structure vorticity, mediated by field. show promise platform for manipulation properties spin-orbit coupling beams.