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- W4302010624 abstract "Enhancement of light-matter interactions is of great importance for many nanophotonic devices, and one way to achieve it is to feed energy perfectly to the strongly coupled system. Here, we propose gap-perturbed dimerized gratings based on bulk WS2 for flexible control of the strong coupling between quasi-bound state in the continuum (quasi-BIC) and exciton. The simulation results show that when a gap perturbation is introduced into the system resulting in the Brillouin zone folding, BIC transforms into quasi-BIC whose quality factor (Q-factor) is related to the value of gap perturbation. The strong coupling results in the anti-crossover behavior of the absorption spectra, and thus a Rabi splitting energy of 0.235 eV is obtained. Temporal coupled-mode theory is employed to analyze the strong coupling system, and the absorption of the system could be enhanced, by modulating the damping rate of quasi-BIC to make the system satisfy the strong critical coupling condition. Furthermore, polaritonic coherent perfect absorption is achieved by using the two-port source excitation. This work could provide ideas for enhancing light-matter interactions and a promising prospect for polariton-based light-emitting or lasing devices." @default.
- W4302010624 created "2022-10-06" @default.
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- W4302010624 date "2022-10-01" @default.
- W4302010624 modified "2023-10-16" @default.
- W4302010624 title "Polaritonic coherent perfect absorption based on strong critical coupling between quasi-bound state in the continuum and exciton" @default.
- W4302010624 doi "https://doi.org/10.48550/arxiv.2210.00296" @default.
- W4302010624 hasPublicationYear "2022" @default.
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