  The advance in designing arrays of ultrathin two-dimensional optical
nano-resonators, 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
interface through electrically gating in 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.
