Extraordinary momentum and spin in evanescent waves.

@article{Bliokh2013ExtraordinaryMA,
  title={Extraordinary momentum and spin in evanescent waves.},
  author={Konstantin Y. Bliokh and Aleksandr Ya Bekshaev and Franco Nori},
  journal={Nature communications},
  year={2013},
  volume={5},
  pages={
          3300
        }
}
Momentum and spin represent fundamental dynamic properties of quantum particles and fields. In particular, propagating optical waves (photons) carry momentum and longitudinal spin determined by the wave vector and circular polarization, respectively. Here we show that exactly the opposite can be the case for evanescent optical waves. A single evanescent wave possesses a spin component, which is independent of the polarization and is orthogonal to the wave vector. Furthermore, such a wave… 

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