Fig. 4: Optical-absorption-induced hot bath.
From: Two-dimensional optomechanical crystal cavity with high quantum cooperativity
a Diagram illustrating the proposed model of heating of the mechanics due to optical absorption and the various baths coupled to the localized mechanical mode. b Plot of measured np versus nc. The solid line is a fit to the data giving \({n}_{{\rm{p}}}=(1.1)\times {n}_{{\rm{c}}}^{0.3}\). Dashed line indicates np versus nc for a 1D nanobeam device measured in ref. 32 for comparison. c Plot of measured linewidth γ (blue dots) versus nc. The blue solid line is a power-law fit to the data, where in the low nc regime \(\gamma /2\pi \approx {\gamma }_{\phi }/2\pi +{\gamma }_{{\rm{p}}}/2\pi =14.54\,\,\text{kHz}\,+(1.1\,\,\text{kHz}\,)\times {n}_{{\rm{c}}}^{0.61}\) and in the high nc regime \(\gamma /2\pi =23.91\,\,\text{kHz}\,+(9.01\,\,\text{kHz}\,)\times {n}_{{\rm{c}}}^{0.29}\). The red solid curve is the resulting fit for γp by itself. For comparison, the dashed red curve is a plot of γp versus nc for a 1D nanobeam device from ref. 32. Error bars correspond to 90% confidence interval in fit to Lorentzian spectral linewidth (error bars smaller than the symbol are not shown). In b, c the quasi-2D OMC cavity measurements are for the same 8-shield device as in Fig. 3c.
