Fig. 3: Dissipative and dispersive contributions to optomechanical backaction.
From: Dissipative optomechanics in high-frequency nanomechanical resonators
a Thermo-mechanical spectrum of the differential optical mode in our device at an input power Pin = 2.7 μW. Each peak corresponds to the acoustic breathing mode of individual nanobeams. b Map of the mechanical spectra as a function of the laser-cavity detuning Δ. The vertical dashed line corresponds to the spectrum in (a). The reflection at every Δ in our measurement is also provided; the gray arrow indicates the associated axis. c (d) Optically induced modifications to the mechanical linewidth of mechanical modes 1 and 2 for the differential (common) optical modes, as a function of the number of photons in the resonator. e Selective phonon lasing contrasted to optomechanical cooling in the differential optical mode. f The same analysis for the common optical mode.
