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Nano Lett. 2013 Sep 11;13(9):4148-51. doi: 10.1021/nl401734r. Epub 2013 Aug 29.

Spin-enabled plasmonic metasurfaces for manipulating orbital angular momentum of light.

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Department of Physics, Hong Kong Baptist University , Kownloon Tong, Kowloon, Hong Kong.


Here, we investigate the spin-induced manipulation of orbitals using metasurfaces constructed from geometric phase elements. By carrying the spin effects to the orbital angular momentum, we show experimentally the transverse angular splitting between the two spins in the reciprocal space with metasurface, as a direct observation of the optical spin Hall effect, and an associated global orbital rotation through the effective orientations of the geometric phase elements. Such spin-orbit interaction from a metasurface with a definite topological charge can be geometrically interpreted using the recently developed high order Poincaré sphere picture. These investigations may give rise to an extra degree of freedom in manipulating optical vortex beams and orbitals using "spin-enabled" metasurfaces.


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