Manipulating terahertz phonon-polariton in the ultrastrong coupling regime with bound states in the continuum

Jiaxing Yang; Liyu Zhang; Kai Wang; Chen Zhang; Aoyu Fan; Zijian He; Zhidi Li; Xiaobo Han; Furi Ling; Peixiang Lu

doi:10.1038/s41377-025-02044-0

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Manipulating terahertz phonon-polariton in the ultrastrong coupling regime with bound states in the continuum

Original Articles

- Manipulating terahertz phonon-polariton in the ultrastrong coupling regime with bound states in the continuum
- Light: Science & Applications Vol. 14, Issue 11, Pages: 3747-3755(2025)
- Affiliations：
  
  1.Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan, China
  2.School of Electronic and Information Engineering, Hubei University of Science and Technology, Xianning, China
  3.School of Optics and Electronic Information, Huazhong University of Science and Technology Wuhan, Wuhan, Hubei, China
  4.Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan, China
- Author bio：
  
  Kai Wang (kale_wong@hust.edu.cn)
  Furi Ling (lingfuri@mail.hust.edu.cn)
  Peixiang Lu (lupeixiang@hust.edu.cn)
- Funds：
- DOI：10.1038/s41377-025-02044-0
  CLC：
- Received：26 November 2024，
  
  Revised：2025-08-26，
  
  Accepted：09 September 2025，
  
  Published Online：09 October 2025，
  
  Published：30 November 2025
- Accepted：
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Yang, J. X. et al. Manipulating terahertz phonon-polariton in the ultrastrong coupling regime with bound states in the continuum. Light: Science & Applications, 14, 3747-3755 (2025).
DOI：

Yang, J. X. et al. Manipulating terahertz phonon-polariton in the ultrastrong coupling regime with bound states in the continuum. Light: Science & Applications, 14, 3747-3755 (2025). DOI： 10.1038/s41377-025-02044-0.

摘要

Abstract

The strong coupling between photons and phonons in polar materials gives rise to phonon-polaritons that encapsulate a wealth of physical information

offering crucial tools for the ultrafast terahertz sources and the topological engineering of terahertz light. However

it is still quite challenging to form and manipulate the terahertz phonon-polaritons under the ultrastrong coupling regime till now. In this work

we demonstrate the ultrastrong coupling between the phonon (at 0.95 THz) in a MAPbI

film and the metallic bound states in the continuum (BICs) in Au metasurfaces. The Rabi splitting can be continuously tuned from 28% to 48.4% of the phonon frequency by adjusting the parameters (size

shape and period) of Au metasurfaces

reaching the ultrastrong coupling regime. By introducing wavelet transform

the mode evolution information of the terahertz phonon-polariton is successfully extracted. It indicates that the phonon radiation intensity of the MAPbI

film is enhanced as the coupling strength is increased. This work not only establishes a new platform for terahertz devices but also opens new avenues for exploring the intricate dynamics of terahertz phonon-polaritons.

关键词

Keywords

references

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