Fig. 1. Sketch of the system.

Fig. 2. Intracavity steady-state mean photon number |as|2 varies with (a) the sphere–mirror separation and (b) the power of the controlling field. The parameters used are m=145  ng, ωm=2π×947  kHz, Γm=2π×141  Hz, R=150  nm, κ=2π×215  Hz, ωl=2  πc/λ, λ=1064  nm, g=2π×70  GHz/μm, and Δl=ωm. In addition, (a) Pl=10  μW and (b) d=2 nm.

Fig. 3. Output spectra for different values of the sphere–mirror separation d: (a) d=∞, (b) d=2  nm, (c) d=1.8  nm, and (d) d=1.5  nm. We use εp=εl/2. The power of the controlling field is Pl=30  μW. The other parameters are the same as in Fig. 2.

Fig. 4. Output spectra for different values of the optomechanical coupling strength g: (a) g=g0, (b) g=2g0, (c) g=3g0, (d) g=4g0, here g0=70  GHz/μm. The sphere–mirror separation is d=2  nm. The other parameters are the same as in Fig. 2.