Boosting strong self-hybrid coupling in simple bulk transition metal dichalcogenides metasurfaces

The emergence of exciton-polaritons in transition metal dichalcogenides (TMDs) has sparked keen interest due to their exceptional optical features, enabling investigations into fascinating physical phenomena such as superfluidity and Bose-Einstein condensation. However, the comprehensive examination of strong coupling, featuring substantial Rabi splitting, simultaneously engaging surface plasmon polariton (SPP) modes, anapole resonances, and excitons, remains limited. In this contribution, we computationally unravel the strong coupling of an SPP-anapole-exciton complex, supported by a novel metasurface design featuring a bulk WS 2 nanodisk array separated by a SiO 2 spacer and overlaid with an Al film. This innovative setup fosters profound interactions among SPP modes, anapole states, and excitons within the bulk WS 2 nanodisks, resulting in an impressive Rabi splitting of 407 meV. Our proposed hybrid metasurfaces present a promising avenue for achieving strong coupling among diverse optical responses in light-matter interactions, thereby catalyzing the development of advanced polaritonic devices with novel functionalities.