Enhanced second-order sideband via surface plasmon polaritons in a low-Q microcavity

We investigate the creation of optical second-order sideband (OSS) from a hybrid system consisting single quantum dot (QD), spherical metallic nanoparticle, and low-Q microcavity driven with weak probe strong control field. Beyond conventional linearized description, we solve nonlinear Heisenberg–Langevin equations for achieving coefficient OSS by employing perturbation technique. It is shown that plasmon cavity modes induces formation surface polaritons, resulting in controllable interaction can be enhanced into coupling regime even if cavity–QD initially weak-coupling regime. As result, generation splitting transmission spectra observed. In addition, it also size metal nanoparticle (MNP) has profound effect on output spectrum, which might form precision self-referenced detection scheme extracting information MNP.