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Guided 2D exciton-polaritons, resulting from the strong coupling of excitonsin semiconductors with non-radiating waveguide modes, provide an attractiveapproach towards developing novel on-chip optical devices. These quasiparticlesare characterized by long propagation distances and efficient nonlinearinteraction but cannot be directly accessed from the free space. Here wedemonstrate a powerful approach for probing and manipulating guided polaritonsin a Ta2O5 slab integrated with a WS2 monolayer using evanescent couplingthrough a high-index solid immersion lens. Tuning the nanoscale lens-sample gapallows for extracting all the intrinsic parameters of the system. We alsodemonstrate the transition from weak to strong coupling accompanied by theonset of the motional narrowing effect: with the increase of exciton-photoncoupling strength, the inhomogeneous contribution to polariton linewidth,inherited from the exciton resonance, becomes fully lifted. Our results enablethe development of integrated optics employing room-temperatureexciton-polaritons in 2D semiconductor-based structures.

Probing and control of guided exciton-polaritons in a 2D semiconductor-integrated slab waveguide