Fig. 2: Ground-state cooling of the mechanical mode.
From: High photon-phonon pair generation rate in a two-dimensional optomechanical crystal
a Room-temperature optical spectrum as a function of the laser-cavity detuning Δ = ωl − ωc. The fit (black) takes into account the Fano lineshape of the mode. b Mechanical response of the OMC at T = 3 K. c Backaction cooling and amplification as a function of photon number (nc), under both red- and blue-detuned excitation. d Ground-state cooling of the mechanical mode. The black (gray) dashed curve depicts a cooling model including (neglecting) parasitic optical heating. Inset: mechanical spectrum for the highest intracavity occupation in the experiment, nc ≈ 5500. Dashed line: multimode fit of the mechanical spectrum; solid line: fit results for the mode of interest. The error bars represent one standard deviation of the parameter estimated through uncertainty propagation accounting for both nonlinear fit residuals and experimental uncertainties.
