Optomechanically induced transparency in Four-wave mixing atomic ensemble assisted Laguerre-Gaussian vortex cavity system

TL;DR

This paper explores how orbital angular momentum differences in a cold atom Laguerre-Gaussian vortex cavity system influence optomechanically induced transparency, enabling control over light propagation and output patterns.

Contribution

It introduces a novel hybrid system where atomic OAM modulates OMIT spectra and output patterns, providing new methods for optical response control.

Findings

OAM difference modulates the OMIT spectrum.

Loop phase enables switching of absorption and gain.

Group delay is tunable by OAM difference.

Abstract

We investigate the steady-state optical response of a Laguerre-Gaussian vortex cavity system integrated with cold atoms featuring a double-$\Lambda$ energy level structure. Within this hybrid system, the atoms are driven by cavity mode and three coherent vortex beams, each carrying independent orbital angular momentum (OAM). We first check the steady-state output spectrum of the hybrid system in the passive/active case (without/with external cavity driving). Our findings reveal that the optomechanically induced transparency (OMIT) spectrum is modulated by the OAM difference $(\Delta \ell\hbar)$ from the atomic component throughout the four-wave mixing (FWM) process. The resulting loop phase ($\Delta \ell\theta$) can achieve a switching effect on the absorption and gain behavior of the hybrid system for the probe beam. Additionally, the group delay, indicative of fast/slow light phenomena, is also tuned by $\Delta \ell$. We further display how the atomic OAM modulates the periodicity of the output spot pattern in the hybrid system. This research provides valuable insights into the modulation of optical responses in Laguerre-Gaussian vortex cavity systems.