Optical bistability and cooling of a mechanical oscillator induced by radiation pressure in a hybrid optomechanical system

TL;DR

This paper theoretically explores how optical feedback from an atomic ensemble influences optical bistability and ground state cooling of a mechanical oscillator in a hybrid optomechanical system, demonstrating enhanced cooling efficiency.

Contribution

It introduces a hybrid system model showing how atomic cavity coupling controls optical bistability and improves cooling performance over standard setups.

Findings

Optical bistability can be tuned via laser parameters and atom-cavity coupling.

Hybrid system achieves more efficient cooling than generic optomechanical systems.

Effective cooling is maintained even at room temperature.

Abstract

We investigate theoretically the effect of optical feedback from a cavity containing an ultracold two level atomic ensemble, on the bistable behavior shown by mean intracavity optical field and the ground state cooling effect of the mechanical oscillator in an optomechanical cavity resonator. The optical bistability can be controlled by tuning the frequency and power of the single driving laser as well as by varying the atom-cavity coupling strength in the atomic cavity. Study of the cooling of the mechanical oscillator, in both good and bad cavity limits, reveals that the hybrid system is more efficient in cooling in comparison to a generic optomechanical setup, even at room temperature. In essence, our work emphasizes the impact of the coupling with the atomic cavity on the radiation pressure effects in the optomechanical cavity.