Enhancement of Optical Spin-Orbit Coupling in Anisotropic ENZ Metamaterials

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Abstract

Vector vortex beams which possess complex intensity and polarisation patterns, and phase or polarisation singularities are important in a variety of applications ranging from high resolution imaging and data transmission to nonlinear optics and quantum technologies. Here, we theoretically analyse the effect of vector vortex beams propagation through strongly anisotropic metamaterials exhibiting epsilon-near-zero behaviour. The interaction of the metamaterial with longitudinal field of the vector beams results in a strong modification of the polarisation distribution, with the metamaterial acting as an azimuthal polariser. The dependence on the local ellipticity of the field is also investigated revealing conversion of spin angular momentum to orbital angular momentum and polarisation structure vorticity, mediated by the longitudinal field. The results show the promise of an anisotropic metamaterial platform for manipulation of polarisation properties of and spin-orbit coupling in vector vortex beams.
Original languageEnglish
JournalIEEE Photonics Journal
Volume15
Issue number1
DOIs
Publication statusPublished - 27 Dec 2022

Keywords

  • Epsilon-near-zero
  • Hyperbolic metamaterials
  • Spin-orbit coupling
  • Vector Vortex Beams

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