Gate-Tunable Emission of Exciton–Plasmon Polaritons in Hybrid MoS₂‑Gap-Mode Metasurfaces

The advance in designing arrays of ultrathin two-dimensional optical nanoresonators, known as metasurfaces, is currently enabling a large variety of novel flat optical components. The remarkable control over the electromagnetic fields offered by this technology can be further extended to the active regime in order to manipulate the light characteristics in real-time. In this contribution, we couple the excitonic resonance of atomic thin MoS₂ monolayers with gap-surface-plasmon (GSP) metasurfaces, and demonstrate selective enhancement of the exciton–plasmon polariton emissions. We further demonstrate tunable emissions by controlling the charge density at the interface through electrically gating in the Metal-Oxide-Semiconductor (MOS) structure. Straddling two very active fields of research, this demonstration of electrically tunable light-emitting metasurfaces enables real-time manipulation of light–matter interactions at the extreme subwavelength dimensions.