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

Su Hyun Gong, Filippo Alpeggiani, Beniamino Sciacca, Erik C. Garnett, L. Kuipers

Research output: Contribution to journalArticlepeer-review

199 Citations (Scopus)


The emergence of two-dimensional transition metal dichalcogenide materials has sparked intense activity in valleytronics, as their valley information can be encoded and detected with the spin angular momentum of light. We demonstrate the valley-dependent directional coupling of light using a plasmonic nanowire-tungsten disulfide (WS2) layers system. We show that the valley pseudospin in WS2 couples to transverse optical spin of the same handedness with a directional coupling efficiency of 90 ± 1%. Our results provide a platform for controlling, detecting, and processing valley and spin information with precise optical control at the nanoscale.

Original languageEnglish
Pages (from-to)443-447
Number of pages5
Issue number6374
Publication statusPublished - 2018 Jan 26
Externally publishedYes

Bibliographical note

Funding Information:
S.-H.G., F.A., and L.K. acknowledge funding from European Research Council (ERC) Advanced Investigator Grant no. 340438-CONSTANS. This work is part of the research program of The Netherlands Organization for Scientific Research (NWO). F.A. acknowledges support from the Marie Skłodowska-Curie individual fellowship BISTRO-LIGHT (no. 748950). B.S. and E.C.G. were supported by funding from the ERC under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC grant agreement no. 337328, “NanoEnabledPV.” All data are reported in the main text and supplementary materials.

Publisher Copyright:
© 2017 The Authors.

ASJC Scopus subject areas

  • General


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