Cascaded Optomechanically Induced Amplification

Cavity optomechanical system(COMS)is a system in which the mutual coupling between a movable optical mirror and radiation field of the optical cavity through radiation pressure is realized.Recent years,the study of the properties of the optomechanical system has aroused widespread attention from researchers.For example,these applications include cooling the micromachine to the quantum ground state,optomechanically induced transparency,optomechanically induced amplification,quantum nonlinear research,ultra-high-precision measurement,entanglement between movable mirror and cavity field,spectral application and macroscopic quantum state superposition,etc.This article mainly studies the light absorption characteristics in the optomechanical system,where the mechanical resonators are driven by the time-dependent forces,respectively.It is found that in two or three tunnel-coupled optomechanical cavities,there appear sideband windows in the absorption spectra,which identifies the normal-mode splitting for the strong couplings between the cavities.Meanwhile,the central transparency dips character the interference induced by the optomechanical interactions.Here we exhibit a cascaded optical amplification scheme,in which the oscillators in the optomechanical array are driven by the external forces,the transparency dips in the absorption spectra are turned into the amplification ones.The amplification magnitudes become stronger when the number of the mechanical driven oscillators are lager.This study may be useful in enhancing the signal in quantum information process based on the OMS chain.