Giant lateral optical forces on Rayleigh particles near hyperbolic and extremely anisotropic metasurfaces

We report a dramatic enhancement of the lateral optical forces induced on electrically polarizable Rayleigh particles near hyperbolic and extremely anisotropic metasurfaces under simple plane-wave illumination. Such enhancement is enabled by the interplay between the ultraconfined surface plasmons supported by these structures and the out-of-plane polarization spin acquired by the particle. The resulting giant lateral forces appear over a broad frequency range and may open unprecedented venues for routing, trapping, and assembling nanoparticles.