Photonic Topological Spin Hall Effect Mediated by Vortex Pairs.
Phys Rev Lett
; 123(26): 266101, 2019 Dec 31.
Article
en En
| MEDLINE
| ID: mdl-31951433
ABSTRACT
Over the past decades, topology has provided unique insight into numerous physical phenomena. Here, we report on a topological mechanism for spin-dependent photonic transport. We observe photonic topological defects of bound vortex pairs and unbound vortices generated from a two-dimensional array of nanoantennas, i.e., a metasurface, which is achieved by randomly inserting local deformations in the metasurfaces, inducing the Pancharatnam-Berry phase. The observed spin-dependent bound vortex pairs are established as the origin of the photonic topological spin Hall effect-a subdiffraction-limited spin-split mode in momentum space, while the spin-dependent unbound vortices induce random spin-split modes throughout the entire momentum space as a random Rashba effect. The topological phenomena-creation of bound vortex pairs and unbound vortices-indicate the universality of the topological effect for particles of different natures.
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2019
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Article
País de afiliación:
Israel