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Based on the Lorenz-Mie theory, we derive analytical expressions of radiativeand nonradiative transition rates for different orientations of a point dipoleemitter in the vicinity of an infinitely long circular cylinder of arbitraryradius. Special attention is devoted to the spontaneous decay rate of a dipoleemitter near a subwavelength-diameter nanowire coated with a graphenemonolayer. We show that plasmonic Fano resonances associated with lightscattering by graphene-coated nanowires appear in the Purcell factor as afunction of transition wavelength. Furthermore, the Fano line shape oftransition rates can be tailored and electrically tuned by varying the distancebetween emitter and cylinder and by modulating the graphene chemical potential,where the Fano asymmetry parameter is proportional to the square root of thechemical potential. This gate-voltage-tunable Fano resonance leads to aresonant enhancement and suppression of light emission in the far-infraredrange of frequencies. This result could be explored in applications involvingultrahigh-contrast switching for spontaneous emission in specifically designedtunable plasmonic nanostructures.

Tunable Fano resonances in the decay rates of a pointlike emitter near a graphene-coated nanowire