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Active, in situ control of light at the nanoscale remains a challenge inmodern physics and in nanophotonics in particular. A promising approach is totake advantage of the technological maturity of nano-electromechanical systems(NEMS) and to combine it with on-chip optics. However, in scaling down thedimensions of such integrated devices, the coupling of a NEMS to optical fieldsbecomes challenging. Despite recent progress in nano-optomechanical coupling,active control of optical fields at the nanoscale has not been achieved with anon-chip NEMS thus far. Here, we show a new type of hybrid system, whichconsists of an on-chip graphene NEMS suspended a few tens of nanometers abovenitrogen-vacancy centres (NVC), which are stable single photon emittersembedded in nano-diamonds. Electromechanical control of the photons emitted bythe NVC is provided by electrostatic tuning of the graphene NEMS position,which is transduced to a modulation of NVC emission intensity. Theoptomechanical coupling between the graphene displacement and the NVC emissionis based on near-field dipole-dipole interaction. This class of optomechanicalcoupling increases strongly for smaller distances, making it suitable fordevices with nanoscale dimensions. These achievements hold promise for theselective control of single-emitter arrays on chip, optical spectroscopy ofindividual nano-objects, integrated optomechanical information processing andquantum optomechanics.

Electro-mechanical control of an optical emitter using graphene