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  • Received: Mar. 6, 2019

    Accepted: Apr. 29, 2019

    Posted: Jun. 27, 2019

    Published Online: Jun. 27, 2019

    The Author Email: Fang Zheyu (zhyfang@pku.edu.cn)

    DOI: 10.29026/oea.2019.190008

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    Bowen Li, Shuai Zu, Zhepeng Zhang, Liheng Zheng, Qiao Jiang, Bowen Du, Yang Luo, Yongji Gong, Yanfeng Zhang, Feng Lin, Bo Shen, Xing Zhu, Pulickel M. Ajayan, Zheyu Fang. Large Rabi splitting obtained in Ag-WS2 strong-coupling heterostructure with optical microcavity at room temperature[J]. Opto-Electronic Advances, 2019, 2(5): 190008-1

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Opto-Electronic Advances, Vol. 2, Issue 5, 190008-1 (2019)

Large Rabi splitting obtained in Ag-WS2 strong-coupling heterostructure with optical microcavity at room temperature

Bowen Li1, Shuai Zu1, Zhepeng Zhang2, Liheng Zheng1, Qiao Jiang1, Bowen Du1, Yang Luo1, Yongji Gong3, Yanfeng Zhang2, Feng Lin1, Bo Shen1, Xing Zhu1, Pulickel M. Ajayan3, and Zheyu Fang1,4,*

Author Affiliations

  • 1School of Physics, State Key Laboratory for Mesoscopic Physics, Academy for Advanced Interdisciplinary Studies, and Nano-optoelectronics Frontier Center of Ministry of Education, Peking University, Beijing 100871, China
  • 2Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
  • 3Department of Materials Science and NanoEngineering, Rice University, 6100 Main Street, Houston, TX 77005, USA
  • 4Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

Abstract

Manipulation of light-matter interaction is critical in modern physics, especially in the strong coupling regime, where the generated half-light, half-matter bosonic quasiparticles as polaritons are important for fundamental quantum science and applications of optoelectronics and nonlinear optics. Two-dimensional transition metal dichalcogenides (TMDs) are ideal platforms to investigate the strong coupling because of their huge exciton binding energy and large absorption coefficients. Further studies on strong exciton-plasmon coupling by combining TMDs with metallic nanostructures have generated broad interests in recent years. However, because of the huge plasmon radiative damping, the observation of strong coupling is significantly limited at room temperature. Here, we demonstrate that a large Rabi splitting (~300 meV) can be achieved at ambient conditions in the strong coupling regime by embedding Ag-WS2 heterostructure in an optical microcavity. The generated quasiparticle with part-plasmon, part-exciton and part-light is analyzed with Hopfield coefficients that are calculated by using three-coupled oscillator model. The resulted plasmon-exciton polaritonic hybrid states can efficiently enlarge the obtained Rabi splitting, which paves the way for the practical applications of polaritonic devices based on ultrathin materials.

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