(color online) Schematic diagram for the COMS with laser driving. The Fabry–Pérot cavity consists of two mirrors with high-reflectivity. The left mirror is fixed and the right one is movable, which is modeled as the mechanical resonator. The optical-force induced mirror movement changes the cavity length and in turn induces dispersions for the cavity fields. The single-photon optomechanical coupling is g, and the mechanical frequency is . x denotes displacement of movable mirror.