TMD excitons have been mainly coupled to vertical microcavities made up of dielectric distributed Bragg reflectors and/or metallic mirrors. These vertical structures have enabled to showcase fundamental polaritonic phenomena thanks to the coupling of bright excitons and vertical-cavity modes, including polariton lasing, polariton-polariton nonlinearities and parametric scattering. While these effects had been previously demonstrated in more mature materials such as GaAs, the richness of excitonic species in TMDs enabled to demonstrate the achievement of additional polaritonic species, such as trion-polaritons, Moiré-polaritons and dipolar polaritons, modifying thereby the nature and strength of polariton-polariton interactions.
In this work we take advantage of the weak interlayer van der Waals forces to transfer TMD monolayers and heterobilayers onto dielectric in-plane photonic waveguides and cavities, and study the interaction of different excitonic species with the in-plane photonic modes, engineered thanks to the underlying patterned dielectrics. In particular, we will illustrate how one and the same photonic structure can couple differently to distinct excitonic species.
