Strong instrinsic light-matter coupling was realized within nanostructured bulk flakes of the transition metal dichalcogenide tungsten disulfide. WS2 metasurfaces driven by the concept of symmetry-protected bound states in the continuum (BIC) show sharp resonances, which are tuned over the exciton leading to an, in transmission measurements resolved, anti-crossing pattern with a Rabi splitting of 116 meV. The BIC-inherent control over the systems radiative loss rate leads to a tunable coupling strength, independent of material-intrinsic losses.
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