Light carries spin and momentum. Spin-orbit interactions of light become relevant at the subwavelength scale of nano-optics and nano-photonics, where they allow controlling the spatial degrees of freedom of light selecting the spin states of incident photons. The generation of the surface plasmon vortex-modes around a single elliptical nanohole in a thin gold film is discussed. The vortex carries extrinsic orbital angular momentum induced under linearly polarized illumination, exploiting the rotational symmetry breaking of the nanohole. The SNOM technique has made the experimental demonstration of the vortex-modes generation possible, which is further supported by FEM simulations.
Plasmon vortex-modes generation in the near-field region: Role of the rotational symmetry breaking of the nanostructures
Triolo C.
;
2020-01-01
Abstract
Light carries spin and momentum. Spin-orbit interactions of light become relevant at the subwavelength scale of nano-optics and nano-photonics, where they allow controlling the spatial degrees of freedom of light selecting the spin states of incident photons. The generation of the surface plasmon vortex-modes around a single elliptical nanohole in a thin gold film is discussed. The vortex carries extrinsic orbital angular momentum induced under linearly polarized illumination, exploiting the rotational symmetry breaking of the nanohole. The SNOM technique has made the experimental demonstration of the vortex-modes generation possible, which is further supported by FEM simulations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
