Optical response of a dual membrane active-passive optomechanical cavity

TL;DR

This paper studies a dual membrane optomechanical cavity with quadratic coupling, using advanced non-equilibrium Green's function methods to analyze optical transmission and light speed control, revealing potential for ultra-fast and slow light applications.

Contribution

It introduces a novel dual membrane active-passive cavity system analyzed with Keldysh Green's functions, enabling control over light speed phenomena.

Findings

System can realize ultra-fast and ultra-slow light.

Parameter tuning enables conversion between fast and slow light.

Green's function approach provides detailed transmission analysis.

Abstract

We investigate a dual membrane active-passive cavity where each mechanical membrane individually quadratically coupled to passive and active cavities via two-phonon process. Due to the fact that in the quadratically coupled optomechanical system mean-field approximation fails, hence to analyze the system completely, we switch to a more generalized out of equilibrium approach, namely Keldysh Green's functional approach. We calculate transmission rate using predetermined full retarded Green's function, and then numerically examine the effect of the various parameters on the transmission coefficient and discuss the features and physics behind them in detail. On the basis of the optical responsivity we further extend our study of fast and slow light phenomenon. The results show that our proposed system can not only realize ultra-fast light/ultra-slow light under proper choice of cavity parameters, but realization of the conversion between fast and slow light and vice versa.