Plots showing the resonance spectrum of graphene and graphite resonators. (a) Resonance spectrum showing the fundamental mode and higher modes for a 15 nm thick multilayer graphene sheet taken with optical drive. Inset: optical image of the resonator. Scale bar = 5 μm. (b) Amplitude versus frequency for a single-layer graphene. The red curve represents the Lorentzian fit of the data [124].
