Manipulating strong coupling between exciton and quasibound states in the continuum resonance

Meibao Qin, Junyi Duan, Shuyuan Xiao, Wenxing Liu, Tianbao Yu, Tongbiao Wang, and Qinghua Liao
Phys. Rev. B 105, 195425 – Published 20 May 2022
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Abstract

Strong coupling exhibits the unique ability to preserve quantum sates between light and matter, which is essential for the development of quantum information technology. To explore the physical mechanism behind this phenomenon, we employ the tight-binding method for expanding the temporal coupled-mode theory, with the absorption spectrum formula of coupled system directly obtained in an analytical way. It reveals all the physical meaning of parameters defined in our theory and shows how to tailor line shapes of the coupled systems. Here we set an example to manipulate the strong coupling in a hybrid structure composed of excitons in monolayer WS2 and quasibound states in the continuum supported by the TiO2 nanodisk metasurfaces. The simulated results show that a clear spectral splitting appeared in the absorption curve, which can be controlled by adjusting the asymmetric parameter of the nanodisk metasurfaces and well fitted through our theoretical predictions. Our work not only gives a more comprehensive understanding of such coupled systems but also offers a promising strategy in controlling strong light–matter coupling to meet diversified application requests.

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  • Received 15 December 2021
  • Revised 5 May 2022
  • Accepted 9 May 2022

DOI:https://doi.org/10.1103/PhysRevB.105.195425

©2022 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Meibao Qin1, Junyi Duan2,3, Shuyuan Xiao2,3,*, Wenxing Liu1, Tianbao Yu1,†, Tongbiao Wang1, and Qinghua Liao1

  • 1School of Physics and Materials Science, Nanchang University, Nanchang 330031, People's Republic of China
  • 2Institute for Advanced Study, Nanchang University, Nanchang 330031, People's Republic of China
  • 3Jiangxi Key Laboratory for Microscale Interdisciplinary Study, Nanchang University, Nanchang 330031, People's Republic of China

  • *syxiao@ncu.edu.cn.
  • yutianbao@ncu.edu.cn.

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Issue

Vol. 105, Iss. 19 — 15 May 2022

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