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.
Large Rabi splitting obtained in Ag-WS2 strong-coupling heterostructure with optical microcavity at room temperature
First published at:May 14, 2019
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National Key Research and Development Program of China (Grant No. 2017YFA0205700), National Basic Research Program of China (Grant No. 2015CB932403, 2017YFA0206000), National Natural Science Foundation of China (Grant Nos. 11674012, 61521004, 21790364, 61422501, and 11374023), Beijing Natural Science Foundation (Z180011, and L140007), and Foundation for the Author of National Excellent Doctoral Dissertation of PR China (Grant No. 201420), National Program for Support of Top-notch Young Professionals (Grant No. W02070003).
Get Citation: Li B W, Zu S, Zhang Z P, Zheng L H, Jiang Q et al. Large Rabi splitting obtained in Ag-WS2 strong-coupling heterostructure with optical microcavity at room temperature. Opto-Electron Adv 2, 190008 (2019).
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