Fig. 1: Principle of the experiment.
From: A few-layer graphene nanomechanical resonator driven by multifrequency digital signals
a Experimental setup. XYZ: piezo positioner. Red wavy line: flexible transmission line. \({V}_{{{{\rm{g}}}}}(t)={V}_{{{{\rm{g}}}}}^{{{{\rm{dc}}}}}+s(t)\). PBS: polarizing beam splitter. λ/2, λ/4: half-, quarter-wave plates. An aspheric lens focuses incident light (wavelength ≃ 633 nm) onto the resonator and collects light reflected by the gate50. SDR: software-defined radio. “IQ modulation” represents two experimental streams of filtered voltage pulses forming one symbol stream. Black (red) arrows indicate the propagation direction of radio frequency (optical) waves. b Computed voltage pulse streams before (vertical bars ending in squares) and after (red and blue wavy traces) convolution with a raised cosine (RC) filter. Symbol rate Rsym = 106 Hz. c Averaged power spectral density of the driving force S(f) as a function of spectral frequency, calculated using an RC filter, for drive power at the gate Pd = − 31 dBm and Rsym = 106 Hz. S(f) is superimposed on the background of thermal forces. d Magnitude and phase of the linear mechanical response χ, calculated for a mechanical quality factor Qm = 100. e Constellation diagram of Iout and Qout, the in-phase and quadrature components of the decimated baseband signal at the photodetector output. Source data are provided as a Source Data file. f Frame from a nanomechanically processed video reconstructed from Iout and Qout.
