Spin-Momentum Locking in the Near Field of Metal Nanoparticles
arXiv:1703.00205 · doi:10.1021/acsphotonics.7b00436
Abstract
Light carries both spin and momentum. Spin-orbit interactions of light come into play at the subwavelength scale of nano-optics and nano-photonics, where they determine the behaviour of light. These phenomena, in which the spin affects and controls the spatial degrees of freedom of light, are attracting rapidly growing interest. Here we present results on the spin-momentum locking in the near field of metal nanostructures supporting localized surface resonances. These systems can confine light to very small dimensions below the diffraction limit, leading to a striking near-field enhancement. In contrast to the propagating evanescent waves of surface plasmon-polariton modes, the electromagnetic near-field of localized surface resonances does not exhibit a definite position-independent momentum or polarization. Our results can be useful to investigate the spin-orbit interactions of light for complex evanescent fields. Note that the spin of the incident light can control the rotation direction of the canonical momentum.
23 pages and 7 figures, ACS Photonics - open access
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- Near-field imaging of surface-plasmon vortex-modes around a single elliptical nanohole in a gold film
- Dynamic Nonreciprocity with a Kerr Nonlinear Resonator
- Selective Enhancement of Optical Chirality and Spin Angular Momentum in Plasmonic Near-Field
- Spin-governed topological surfaces and broken spin-momentum locking in a gyromagnetic medium
- Hidden singularities in 3D optical fields
- Designing rotational motion of charges on plasmonic nanostructures excited by circularly polarized light
- Experimental observation of transverse spin of plasmon polaritons in a single-crystalline silver nanowire