Nanoscale chiral valley-photon interface through optical spin-orbit coupling

• DOI: 10.1126/science.aan8010
• Publication Date: 2018-01-25T19:05:29Z
• Authors: Su-Hyun Gong; Filippo Alpeggiani; Beniamino Sciacca; Erik C. Garnett; L. Kuipers
• Keywords: Valleytronics; Nanophotonics

The emergence of two-dimensional transition metal chalcogenide materials has sparked an intense activity in valleytronics since their valley information can be directly encoded and detected by using the spin angular momentum light. For practical applications such as on-chip logic gates chip-to-chip transport, encoding processing pseudospin light should extended to integrated, nanophotonic system. Here, we successfully demonstrate, at room temperature, valley-dependent directional coupling a plasmonic nanowire-WS2 layers Our calculations show that local transverse mode nanowire provides robust optical spin-path locking up 91 %. Experimentally demonstrate WS2 is coupled with same handedness exhibits high efficiency 90 % guided mode. result opens new avenues controlling, detecting precise control nanoscale.