Ultrafast Investigation of Multiple Strong Coupling System Based on Monolayer MoS 2 -Ag Nanodisk Arrays.
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| Title: | Ultrafast Investigation of Multiple Strong Coupling System Based on Monolayer MoS 2 -Ag Nanodisk Arrays. |
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| Authors: | Zhang, Jia1 (AUTHOR), Chen, Yuxuan2 (AUTHOR), Zhao, Leyi1,2 (AUTHOR) yuxuan66.chen@connect.polyu.hk, Xu, Menghan1,2 (AUTHOR), Wang, Hai1 (AUTHOR) wanghai03@jlu.edu.cn |
| Source: | Nanomaterials (2079-4991). Mar2026, Vol. 16 Issue 5, p339. 10p. |
| Subjects: | Polaritons, Two-dimensional materials (Nanotechnology), Absorption spectra |
| Abstract: | A multiple strong coupling system comprising monolayer MoS2 and Ag nanodisk (Ag-ND) arrays is investigated using transient absorption (TA) spectroscopy. By tuning the diameter and period of the Ag-NDs arrays, the surface plasmon polariton (SPP) resonances are made to simultaneously overlap with the A (~660 nm) and B (~608 nm) excitons of monolayer MoS2. As a result, three distinct negative ground-state bleaching (GSB) peaks, corresponding to the upper (UP), middle (MP), and lower (LP) hybrid polariton states, were observed in the TA spectra. This confirms that a multiple strong coupling regime was achieved with both the A and B excitons of monolayer MoS2 and SPPs modes, which was also highlighted by the anti-crossing behavior across varied Ag-NDs arrays parameters. Finally, by adding an insulating spacer layer of Al2O3 film, the coupling strength can be modulated from a strong coupling regime to a weak coupling regime. These results reveal a multi-exciton–plasmon strong coupling system and establish a versatile platform for ultrathin polaritonic devices, including polariton lasers and all-optical switches. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | A multiple strong coupling system comprising monolayer MoS2 and Ag nanodisk (Ag-ND) arrays is investigated using transient absorption (TA) spectroscopy. By tuning the diameter and period of the Ag-NDs arrays, the surface plasmon polariton (SPP) resonances are made to simultaneously overlap with the A (~660 nm) and B (~608 nm) excitons of monolayer MoS2. As a result, three distinct negative ground-state bleaching (GSB) peaks, corresponding to the upper (UP), middle (MP), and lower (LP) hybrid polariton states, were observed in the TA spectra. This confirms that a multiple strong coupling regime was achieved with both the A and B excitons of monolayer MoS2 and SPPs modes, which was also highlighted by the anti-crossing behavior across varied Ag-NDs arrays parameters. Finally, by adding an insulating spacer layer of Al2O3 film, the coupling strength can be modulated from a strong coupling regime to a weak coupling regime. These results reveal a multi-exciton–plasmon strong coupling system and establish a versatile platform for ultrathin polaritonic devices, including polariton lasers and all-optical switches. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 20794991 |
| DOI: | 10.3390/nano16050339 |
