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Room Temperature Chiral Coupling of Valley Excitons with Spin-Momentum Locked Surface Plasmons

  • Thibault Chervy
    Thibault Chervy
    ISIS and icFRC, Université de Strasbourg and CNRS, UMR 7006, F-67000 Strasbourg, France
  • Stefano Azzini
    Stefano Azzini
    ISIS and icFRC, Université de Strasbourg and CNRS, UMR 7006, F-67000 Strasbourg, France
  • Etienne Lorchat
    Etienne Lorchat
    Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
  • Shaojun Wang
    Shaojun Wang
    Dutch Institute for Fundamental Energy Research, Eindhoven, The Netherlands
    More by Shaojun Wang
  • Yuri Gorodetski
    Yuri Gorodetski
    Mechanical Engineering and Mechatronics Department and Electrical Engineering and Electronics Department, Ariel University, Ariel 40700, Israel
  • James A. Hutchison
    James A. Hutchison
    ISIS and icFRC, Université de Strasbourg and CNRS, UMR 7006, F-67000 Strasbourg, France
  • Stéphane Berciaud
    Stéphane Berciaud
    Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
  • Thomas W. Ebbesen
    Thomas W. Ebbesen
    ISIS and icFRC, Université de Strasbourg and CNRS, UMR 7006, F-67000 Strasbourg, France
  • , and 
  • Cyriaque Genet*
    Cyriaque Genet
    ISIS and icFRC, Université de Strasbourg and CNRS, UMR 7006, F-67000 Strasbourg, France
    *E-mail: [email protected]
Cite this: ACS Photonics 2018, 5, 4, 1281–1287
Publication Date (Web):January 25, 2018
Copyright © 2018 American Chemical Society

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    Abstract Image

    We demonstrate room temperature chiral coupling of valley excitons in a transition metal dichalcogenide monolayer with spin-momentum locked surface plasmons. At the onset of the strong coupling regime, we measure spin-selective excitation of directional flows of polaritons. Operating under such conditions, our platform yields surprisingly robust intervalley contrasts (ca. 40%) and coherence (ca. 5–8%) as opposed to their total absence for the uncoupled valley excitons at room temperature. These results open rich possibilities, easy to implement, in the context of chiral optical networks.

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    Supporting Information

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsphotonics.7b01032.

    • Section A. Linear absorption dispersion analysis: details the first derivative absorption spectra and the coupled oscillator fits from which the strong coupling criterion is derived. Section B. Chiraliton diffusion length: presents the measurements of the 1/e decay length of the polaritonic states. Section C. Resonant second harmonic generation on a WS monolayer: displays the valley contrasted resonant second harmonic spectra. Section D. PL lifetime measurement on the coupled system: shows the results of Time-Correlated Single Photon Counting under picosecond pulsed excitation of the WS monolayer. Section E. Optical setup: presents the setup used for the angle-resolved polarimetric measurements. Section F. Valley contrast measurements on a bare WS monolayer: reports the absence of valley contrasts measured at room temperature on a bare monolayer. Section G. Angle-resolved Stokes vector polarimetry: details the polarimetric approach implemented for characterizing the polarization state of the chiraliton and the degree of intervalley coherence (PDF).

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