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

Journal article (2018)

Authors

S. Gong AMOLF, QN/Kuipers Lab - AS , Kavli institute of nanoscience Delft
F. Alpeggiani AMOLF, Kavli institute of nanoscience Delft, QN/Kuipers Lab - AS
L. Kuipers QN/Quantum Nanoscience , AMOLF, Kavli institute of nanoscience Delft
Research Group
QN/Kuipers Lab (AS) (TU Delft)
Copyright: © 2018 S. Gong, F. Alpeggiani, Beniamino Sciacca, Erik C. Garnett, L. Kuipers
DOI: https://doi.org/10.1126/science.aan8010
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Published Date

2018

Language

English

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Kuipers Lab

Abstract

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.

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