Tamm‐Plasmon Exciton‐Polaritons in Single‐Monolayered CsPbBr<sub>3</sub> Quantum Dots at Room Temperature

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  • Meng‐Cheng Yen
    Graduate Institute of Photonics and Optoelectronics Department of Electrical Engineering National Taiwan University (NTU) No. 1, Sec. 4, Roosevelt Road Taipei 10617 Taiwan
  • Chia‐Jung Lee
    Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan 70101 Taiwan
  • Yung‐Chi Yao
    Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan 70101 Taiwan
  • Yuan‐Ling Chen
    Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan 70101 Taiwan
  • Sheng‐Chan Wu
    Department of Photonics National Cheng Kung University Tainan 70101 Taiwan
  • Hsu‐Cheng Hsu
    Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan 70101 Taiwan
  • Yuto Kajino
    Institute for Materials Chemistry and Engineering (IMCE) Kyushu University 744 Motooka Nishiku Fukuoka 819‐0395 Japan
  • Gong‐Ru Lin
    Graduate Institute of Photonics and Optoelectronics Department of Electrical Engineering National Taiwan University (NTU) No. 1, Sec. 4, Roosevelt Road Taipei 10617 Taiwan
  • Kaoru Tamada
    Institute for Materials Chemistry and Engineering (IMCE) Kyushu University 744 Motooka Nishiku Fukuoka 819‐0395 Japan
  • Ya‐Ju Lee
    Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan 70101 Taiwan

抄録

<jats:title>Abstract</jats:title><jats:p>Constructing polaritonic devices in monolithic, ultra‐compact photonic architectures with monolayer‐featured exciton‐emitters is decisive to exploit the coherent superposition between entangled photonic and excitonic eigenstates for potential realizations of optical nonlinearities, macroscopic condensations, and superfluidity. Here, a feasible strategy for exciton‐polariton formations is demonstrated by implementing a Tamm‐plasmon (TP) polaritonic device with the active material composed of single‐monolayered perovskite (CsPbBr<jats:sub>3</jats:sub>) quantum dots (QDs). The metallic character of the TP configuration is able to concentrate its resonance mode into a confined region beyond the diffraction limit, which highly overlaps, both spatially and spectrally, with the single‐monolayered CsPbBr<jats:sub>3</jats:sub> QDs embedded inside. The mode volume of the device is hence reduced dramatically, leading to an enhanced light–matter coupling strength for the polaritonic emission at room temperature. In particular, it is found that the dispersion relation of the TP polaritonic device is tunable by detuning the excitonic and photonic eigenmodes and that the polariton–polariton interaction energy is strongly dependent on the polariton's spin state. The presented strategy is a determinant step toward the realization of strong light–matter coupling and polariton spintronics in the CsPbBr<jats:sub>3</jats:sub> QDs with a single‐monolayered feature.</jats:p>

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