A rotational-cavity optomechanical system with two revolving cavity mirrors: optical response and fast-slow light mechanism

TL;DR

This paper studies a Laguerre-Gaussian cavity optomechanical system with two rotating mirrors, revealing how orbital angular momentum influences double optomechanically induced transparency and enabling control of fast and slow light.

Contribution

It demonstrates that double-OMIT arises from orbital angular momentum, not momentum, and shows how to switch between ultrafast and ultraslow light by adjusting angular momentum.

Findings

Double-OMIT is caused by orbital angular momentum.

Fast and slow light can be controlled via angular momentum.

Single cavity system suffices for double-OMIT, simplifying previous setups.

Abstract

We investigate the optical behavior of a single Laguerre-Gaussian cavity optomechanical system consisting of two mechanically rotating mirrors. We explore the effects of various physical parameters on the double optomechanically induced transparency (OMIT) of the system and provide a detailed explanation of the underlying physical mechanism. We show that the momentum is not the cause of the current double-OMIT phenomena; rather, it results from the orbital angular momentum between the optical field and the rotating mirrors. Additionally, the double-OMIT is simply produced using a single Laguerre-Gaussian cavity optomechanical system rather than by integrating many subsystems or adding the atomic medium as in earlier studies. We also investigate the impact of fast and slow light in this system. Finally, we show that the switching between ultrafast and ultraslow light can be realized by adjusting the angular momentum, which is a new source of regulating fast-slow light.