Abstract
In this paper, the phenomenon of the optical bistability of a cavity field is theoretically investigated in an optomechanical system containing an N-type atomic ensemble. In this hybrid optomechanical system, the atoms are coupled with two controlling light fields besides coupling with the cavity field. Under the nonresonant condition, we analyze the influences of the coupling strength between cavity and atoms, Rabi frequencies of the controlling light field, the detuning between the controlling light field and atoms, and pump field power on the optical bistable behavior of mean intracavity photon number. The nonlinear distribution of the mean intracavity photon number has a potential application in field optical switches and optical bistable devices.
Highlights
IntroductionFor most objects in the macro world, light pressure does not affect their orbit of motion
For most objects in the macro world, light pressure does not affect their orbit of motion.for nano- or micromechanical oscillators, its motion can be mediated by the electromagnetic radiation pressure force, which results in studies about cavity optomechanics
We have shown that the bistable behavior of the mean intracavity photon number in a hybrid optomechanical system containing N-type atomic ensemble can be generated due to the enhanced nonlinearity
Summary
For most objects in the macro world, light pressure does not affect their orbit of motion. For nano- or micromechanical oscillators, its motion can be mediated by the electromagnetic radiation pressure force, which results in studies about cavity optomechanics. More interesting physical phenomena, such as steady-state entanglement, bistable behavior, and squeezing spectra of transmitted field, ground-state cooling of micromechanical oscillators, and so on, are investigated in references [11,12,13,14,15,16]. The influences of atomic coherence and quantum coherence on optical bistability in a hybrid cavity optomechanical system containing N-type four-level atoms are studied. By solving the steady-state solution of Heisenberg–Langevin equation, we can get the analytical expressions of mean photon number of cavity field depending on physical parameters. The distribution of mean intracavity photon number shows optical bistable behavior due to the nonlinearity of system can be generated
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