Strong coupling in metal-WS2 hybrid system

ORAL

Abstract

Metallic particle array as an effective plasmonic cavity has attracted great interest. Coupling between such plasmonic cavity and gain materials have been reported. In this work, we studied two kinds of polaritons in such system. First, we studied the strong coupling between groove localized surface plasmon resonance (LSPR) and lattice surface plasmon polariton in a metallic groove array. We found that the optical response of such system is different from the ordinary weak coupling surface lattice resonance. A giant Rabi splitting of ~440 meV was observed, both angle and pitch tuning. The underlying mechanism is analyzed. Next, we studied the coupling between the metallic grating and the exciton in WS2 monolayer. LSPR was used. The parallel electric field within the groove can provide an effective coupling to the excitons of monolayer WS2. To overcome the problem of angle tuning reported in previous work, we developed a depth chirped grating to realize the resonance tuning. A moderate Rabi splitting of 56 meV was observed. These works demonstrate the potential application in strong coupling devices based on plasmonic cavity.

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Presenters

  • Jinwei Shi

    Physics, Beijing Normal University

Authors

  • Jinwei Shi

    Physics, Beijing Normal University

  • Dahe Liu

    Physics, Beijing Normal University

  • Chih-Kang Shih

    Department of Physics, The University of Texas at Austin, Austin, Texas, 78712, USA., University of Texas at Austin, Physics, University of Texas at Austin, Department of Physics, University of Texas at Austin, TX 78712, United States, Department of Physics, The University of Texas at Austin, Department of Physics, The University of Texas at Austin, USA

  • Yi-Hsien Lee

    National Tsing Hua University, Materials Science and Engineering, National Tsing Hua University, National Tsing-Hua University

  • Shangjr Gwo

    Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan, National Tsing-Hua University