Tunable subluminal and superluminal light with optomechanical-induced transparency under steady-state configuration

Abstract

We study a two-cavity optomechanical system in which one cavity (A) encloses a mechanical resonator and the other cavity (C) encloses a two-level atom are, respectively, driven by a strong pump and a weak probe fields. In addition to a direct pathway, the excitations in cavity C and the enclosed atom can also be caused through an indirect pathway. The interference between the two possible routs for excitations produces a controllable transparency window in the probe transmission spectrum of cavity C. The coupling strength between cavity C and the atom works as an additional parameter to the coupling strength between the two cavities which helps to manipulate the dynamical properties of the system and hence to control the width of the transparency window. Furthermore, we show that the single setup can be used to produce an optical switch from two different physical behaviors of the model, and to realize subluminal and superluminal behaviors in the output spectrum at probe frequency of cavity C.

Optomechanically induced transparency and possible application in a quadratic-coupling optomechanical system with an induced electric field

“…Zhang et al [54] presented double OMIT in a compound optomechanical system due to the linear and quadratic coupling between the cavity and the membrane. Khan et al [58] recently reported controllable OMIT in a two-cavity optomechanical system due to the interference between the two possible routs for excitations. Liao et al [59] investigated OMIT in a hybrid optomechanical system with Kerr medium which could be tuned from slow light to fast light.…”