Strong light-matter coupling in MoS${}_2$

Abstract

Polariton-based devices require materials where light-matter coupling under ambient conditions exceeds losses, but our current selection of such materials is limited. Here we measured the dispersion of polaritons formed by the $A$ and $B$ excitons in thin MoS${}_2$ slabs by imaging their optical near fields. We combined fully tunable laser excitation in the visible with a scattering near-field optical microscope to excite polaritons and image their optical near fields. We obtained the properties of bulk MoS${}_2$ from fits to the slab dispersion. The in-plane excitons are in the strong regime of light-matter coupling with a coupling strength ($40-100$meV) that exceeds their losses by at least a factor of two. The coupling becomes comparable to the exciton binding energy, which is known as very strong coupling. MoS${}_2$ and other transition metal dichalcogenides are excellent materials for future polariton devices.

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• Modal expansions in periodic photonic systems with material loss and dispersion
• Immunity of intersubband polaritons to inhomogeneous broadening

Cited by in corpus (4)

• Towards compact phase-matched and waveguided nonlinear optics in atomically layered semiconductors
• In-plane anisotropy in biaxial ReS2 crystals probed by nano-optical imaging of waveguide modes
• Light propagation and magnon-photon coupling in optically dispersive magnetic media
• Strong coupling of quantum emitters and the exciton polariton in MoS${}_2$ nanodisks