title: Photonic spin Hall effect at metasurfaces.
abstract: The spin Hall effect (SHE) of light is very weak because of the extremely small photon momentum and spin-orbit interaction. Here, we report a strong photonic SHE resulting in a measured large splitting of polarized light at metasurfaces. The rapidly varying phase discontinuities along a metasurface, breaking the axial symmetry of the system, enable the direct observation of large transverse motion of circularly polarized light, even at normal incidence. The strong spin-orbit interaction deviates the polarized light from the trajectory prescribed by the ordinary Fermat principle. Such a strong and broadband photonic SHE may provide a route for exploiting the spin and orbit angular momentum of light for information processing and communication.
authors.affiliation: National Science Foundation Nanoscale Science and Engineering Center, 3112 Etcheverry Hall, University of California at Berkeley, Berkeley, CA 94720, USA.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Yin
authors.forename: Ziliang
authors.initials: Z
authors.lastname: Ye
authors.forename: Junsuk
authors.initials: J
authors.lastname: Rho
authors.forename: Yuan
authors.initials: Y
authors.lastname: Wang
authors.forename: Xiang
authors.initials: X
authors.lastname: Zhang