Manipulating terahertz phonon-polariton in the ultrastrong coupling regime with bound states in the continuum
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916962402041856 |
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| author | Yang, Jiaxing Zhang, Liyu Wang, Kai Zhang, Chen Fan, Aoyu He, Zijian Li, Zhidi Han, Xiaobo Ling, Furi Lu, Peixiang |
| author_facet | Yang, Jiaxing Zhang, Liyu Wang, Kai Zhang, Chen Fan, Aoyu He, Zijian Li, Zhidi Han, Xiaobo Ling, Furi Lu, Peixiang |
| contents | 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<sub>3</sub> 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<sub>3</sub> 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_01914 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Manipulating terahertz phonon-polariton in the ultrastrong coupling regime with bound states in the continuum Yang, Jiaxing Zhang, Liyu Wang, Kai Zhang, Chen Fan, Aoyu He, Zijian Li, Zhidi Han, Xiaobo Ling, Furi Lu, Peixiang Optics Applied Physics 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<sub>3</sub> 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<sub>3</sub> 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. |
| title | Manipulating terahertz phonon-polariton in the ultrastrong coupling regime with bound states in the continuum |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2411.01914 |