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The extraordinary properties of graphene make it a very promising materialfor use in optoelectronics. However, this is still a nascent field, where somebasic properties of the electromagnetic field in graphene must be explored.Here we report on the fields radiated by a nanoemitter lying on a graphenesheet. Our results show that this field presents a rich dependence on bothfrequency, distance to the source and dipole orientation. This behavior isattributed to distinct peculiarities on the density of electromagnetic statesin the graphene sheet and the interaction between them. The field is mainlycomposed of an core region of high-intensity electromagnetic field, dominatedby surface plasmons, and an outer region where the field is practically thesame it would be for an emitter in vacuum. Within the core region, theintensity of the electric field is several orders of magnitude larger than whatit would be in vacuum. Importantly, the size of this core region can becontrolled thorough external gates, which opens up many interestingapplications in, for instance, surface optics and spectroscopy. Additionally,the large coupling between nanoemitters and surface plasmons makes graphenesheets a propitious stage for quantum-optics, in which the interaction betweenquantum objects could be externally tailored at will.

Fields radiated by a nanoemitter in a graphene sheet