Optomechanically induced ultraslow and ultrafast light

TL;DR

This paper theoretically demonstrates how to achieve ultraslow and ultrafast light in a passive-active optomechanical system using ideal optomechanically induced transparency, with potential for controlled light speed manipulation.

Contribution

It introduces a method to realize ultraslow and ultrafast light in a passive-active optomechanical system through ideal OMIT conditions, including stopped light.

Findings

Ultraslow light achieved with adjustable dissipation rates.

Stopped light occurs when passive decay matches active gain.

Ultrafast light realized by tuning coupling and decay rates.

Abstract

Slow and fast light is an important and fascinating phenomenon in quantum optics. Here, we theoretically study how to achieve the ultraslow and ultrafast light in a passive-active optomechanical system, based on the ideal optomechanically induced transparency (OMIT). Under the conditions of the ideal OMIT, an abnormal (inverted) transparency window will emerge accompanied with a very steep dispersion, resulting that the ultraslow light can be easily achieved at the transparency window by adjusting the dissipation rates of the two cavities, even with usual mechanical linewidth (such as Hz linewidth). Particularly, as the decay rate of the passive cavity tends to the gain rate of the active cavity, the ideal stopped light can be achieved. Similarly, the ultrafast light can be achieved at transparency window by tuning the coupling strength and the decay rates in the system.