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arXiv · 2103.10867

Strong light-matter coupling in MoS$_2$

Patryk Kusch·Niclas S. Mueller·Martin T. Hartmann·Stephanie Reich
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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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Patryk Kusch, Niclas S. Mueller, Martin T. Hartmann, Stephanie Reich. 2021-03-19. Strong light-matter coupling in MoS$_2$. https://doi.org/10.1103/physrevb.103.235409

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