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We demonstrate the strong coupling of direct transition excitons in tungstendisulfide (WS2) with collective plasmonic resonances at room temperature. Weuse open plasmonic cavities formed by periodic arrays of metallicnanoparticles. We show clear anti-crossings with monolayer, bilayer and thickermultilayer WS2 on top of the nanoparticle array. The Rabi energy of such hybridsystem varies from 50 to 110 meV from monolayer to sixteen layers, while itdoes not scale with the square root of the number of layers as expected forcollective strong coupling. We prove that out-of-plane coupling components canbe disregarded since the normal field is screened due to the high refractiveindex contrast of the dielectric layers. Even though the in-plane dipolemoments of the excitons decrease beyond monolayers, the strong in-plane fielddistributed in the flake can still enhance the coupling strength withmultilayers. However, the screened out-of-plane field leads to the saturationof the Rabi energy. The achieved coherent coupling of TMD multilayers with opencavities could be exploited for manipulating the dynamics and transport ofexcitons in 2D semiconductors and developing ultrafast valley/spintronicdevices.

Screened Strong Coupling of Excitons in Multilayer WS2 with Collective Plasmonic Resonances