Generation and amplification of high-order sideband induced by two-level atoms in a hybrid optomechanical system

摘要

It is quite important to enhance and control the optomechanically inducedhigh-order sideband generation to achieve low-power optical comb andhigh-sensitivity sensing with an integratable structure. Here we present andanalyze a proposal for enhancement and manipulation of optical nonlinearity andhigh-order sideband generation in a hybrid atom-cavity optomechanical systemthat is coherently driven by a bichromatic input field consisting of a controlfield and a probe field and works beyond the perturbative regime. Our numericalanalysis with experimentally achievable parameters confirms that robusthigh-order sideband generation and typical spectral structures withnon-perturbative features can be created even under weak driven fields. Thedependence of the high-order sideband generation on the atomic parameters arealso discussed in detail, including the decay rate of the atoms and thecoupling parameter between the atoms and the cavity field. We show that thecutoff order as well as the amplitude of the higher order sidebands can be welltuned by the atomic coupling strength and the atomic decay rate. The proposedmechanism of enhancing optical nonlinearity is quite general and can be adoptedto optomechanical systems with different types of cavity.