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Enhancing the light-matter interactions in two-dimensional materials viaoptical metasurfaces has attracted much attention due to its potential toenable breakthrough in advanced compact photonic and quantum informationdevices. Here, we theoretically investigate a strong coupling between excitonsin monolayer WS$_2$ and quasi-bound states in the continuum (quasi-BIC). In thehybrid structure composed of WS$_2$ coupled with asymmetric titanium dioxidenanobars, a remarkable spectral splitting and typical anticrossing behavior ofthe Rabi splitting can be observed, and such strong coupling effect can bemodulated by shaping the thickness and asymmetry parameter of the proposedmetasurfaces. It is found that the balance of line width of the quasi-BIC modeand local electric field enhancement should be considered since both of themaffect the strong coupling, which is crucial to the design and optimization ofmetasurface devices. This work provides a promising way for controlling thelight-matter interactions in strong coupling regime and opens the door for thefuture novel quantum, low-energy, distinctive nanodevices by advancedmeta-optical engineering.

Strong coupling between excitons and magnetic dipole quasi-bound states in the continuum in WS$_2$-TiO$_2$ hybrid metasurfaces