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Light emitters in vicinity of a hyperbolic metamaterial (HMM) show a range ofquantum optical phenomena from spontaneous decay rate enhancement to strongcoupling. In this study, we integrate monolayer Molybdenum disulfide (MoS$_2$)emitter in near field region of HMM. The MoS$_2$ monolayer has A and Bexcitons, which emit in the red region of visible spectrum. We find that the Bexcitons couple to HMM differently compared to A excitons. The fabricated HMMtransforms to a hyperbolic dispersive medium at 2.13 eV, from an ellipticaldispersive medium. The selective coupling of B Excitons to the HMM modes isattributed to the inbuilt field gradient of the transition. The B excitonenergy lies close to the transition point of the HMM, relative to A Exciton.So, the HMM modes couple more to the B excitons and the metamaterial functionsas selective coupler. The coupling strength calculations show that coupling is2.5 times stronger for B excitons relative to A excitons. High near field ofHMM, large magnitude and the in-plane transition dipole moment of MoS$_2$Excitons, result in strong coupling of B excitons and formation of hybridlight-matter states. The measured differential Reflection and Photoluminescencespectra indicate the presence of hybrid light-matter states i.e.Exciton-Polaritons. Rabi splitting of at least 129 meV at room temperature isobserved. The low temperature Photoluminescence measurement shows modeanticrossing, which is characteristic feature of hybrid states. Our resultsshow that the HMM works as a energy selective coupler for multi-excitonicsystems as MoS$_2$.

Selectively strong coupling MoS$_2$ excitons to a metamaterial at room temperature