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. 2016 Jan 8;7:10218. doi: 10.1038/ncomms10218

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(a) Time trace of NVC emission (bars) modulated by a driven graphene membrane oscillating at f_m in its near field. Distance-dependent dipolar emitter–graphene coupling imprints the nanomotion of the graphene membrane on the emission. (b) Mechanical resonance obtained from differential oscillating NVC emission. Each point corresponds to the amplitude of the Fourier component at f=f_drive of the emission time trace (as in a). A Lorentzian fit of the data (red line) yields the same value for f_m as obtained independently by optical interferometry. Inset: spatial map of Fourier component at f=f_drive, localized around the emitter position (*). The dashed circle indicates the graphene drum. (c) Dependence of measured (blue) and extrapolated (red) differential NVC emission intensity on the graphene-emitter separation d_G–NVC, normalized by the membrane's resonant oscillation amplitude A_m (which increases with V_g, thus reducing the measurement uncertainty for small separations d_G–NVC). The grey band is an uncertainty interval (cf. Supplementary Note 6).