Fig. 7: Optical spring shifts in optomechanics.
a Ratio of spring shift \(\Delta {\omega }_{\nu }\) to the vibrational linewidth Γtot mapped vs cavity linewidth \(\kappa_c\) and detuning \({\omega }_{l}-{\omega }_{c}\) of laser ωl from cavity ωc, both normalized to vibrational frequency ων, for single-mode cavities. Typical regimes for cold atoms and whispering gallery (WG) resonances are shown dashed. For each \(\kappa_c\), the lowest intensity is used at which \(| \gamma_\nu - \Gamma_{{{\rm{tot}}}}(I_l) | = \gamma_\nu / 2\) over the detuning range. Box shows the results for the NPoM including the full multimode plasmonic response, as considered in the simulations, and with \(\omega_c\) fixed at the NPoM dark-field resonance of 800 nm, giving ~10-fold enhancement. b Comparison of spring shifts per cavity photon vs ων for a range of systems50.
