Fluorescence control through quantum interference mechanisms in a coupled cavity waveguide

In this paper the spontaneous emission from a four-level atom embedded in a coupled cavity waveguide is investigated. It is demonstrated that the coupling between the atom and the non-Markovian reservoir causes additional decay to the excited state, and complicated sources of quantum interference leads to a strong non-Lorentzian shape of emission spectrum in the free space reservoir. Furthermore it is found that applying a driving field can greatly enhance the fluorescence line near the quenching point, which is originated from the coupling effect between a strongly driven atom and a coupled cavity waveguide reservoir.