Tunable Fano Resonance and Plasmon–Exciton Coupling in Single Au Nanotriangles on Monolayer WS<sub>2</sub> at Room Temperature

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  • Mingsong Wang
    Department of Mechanical Engineering Materials Science and Engineering Program Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA
  • Alex Krasnok
    Department of Electrical and Computer Engineering The University of Texas at Austin Austin TX 78712 USA
  • Tianyi Zhang
    Department of Materials Science and Engineering The Pennsylvania State University University Park PA 16802 USA
  • Leonardo Scarabelli
    Bionanoplasmonics Laboratory CIC biomaGUNE Paseo de Miramón 182 20014 Donostia‐San Sebastián Spain
  • He Liu
    Department of Chemistry The Pennsylvania State University University Park PA 16802 USA
  • Zilong Wu
    Department of Mechanical Engineering Materials Science and Engineering Program Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA
  • Luis M. Liz‐Marzán
    Bionanoplasmonics Laboratory CIC biomaGUNE Paseo de Miramón 182 20014 Donostia‐San Sebastián Spain
  • Mauricio Terrones
    Department of Materials Science and Engineering The Pennsylvania State University University Park PA 16802 USA
  • Andrea Alù
    Department of Electrical and Computer Engineering The University of Texas at Austin Austin TX 78712 USA
  • Yuebing Zheng
    Department of Mechanical Engineering Materials Science and Engineering Program Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA

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<jats:title>Abstract</jats:title><jats:p>Tunable Fano resonances and plasmon–exciton coupling are demonstrated at room temperature in hybrid systems consisting of single plasmonic nanoparticles deposited on top of the transition metal dichalcogenide monolayers. By using single Au nanotriangles (AuNTs) on monolayer WS<jats:sub>2</jats:sub> as model systems, Fano resonances are observed from the interference between a discrete exciton band of monolayer WS<jats:sub>2</jats:sub> and a broadband plasmonic mode of single AuNTs. The Fano lineshape depends on the exciton binding energy and the localized surface plasmon resonance strength, which can be tuned by the dielectric constant of surrounding solvents and AuNT size, respectively. Moreover, a transition from weak to strong plasmon–exciton coupling with Rabi splitting energies of 100–340 meV is observed by rationally changing the surrounding solvents. With their tunable plasmon–exciton interactions, the proposed WS<jats:sub>2</jats:sub>–AuNT hybrids can open new pathways to develop active nanophotonic devices.</jats:p>

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