Superluminal Pulse Propagation in a One-sided Nanomechanical Cavity System

TL;DR

This paper demonstrates that in an optomechanical cavity system, the pulse can exhibit superluminal propagation with negative group delay, controllable by the coupling field's power, under electromagnetically induced transparency conditions.

Contribution

It introduces the concept of superluminal pulse propagation in a nanomechanical cavity system and shows how to control it via the coupling field's power.

Findings

Negative group delay indicates superluminal pulse propagation.

Pulse advance is controllable by coupling power.

Superluminal effects occur under electromagnetically induced transparency conditions.

Abstract

We investigate the propagation of a pulse field in an optomechanical system. We examine the question of advance of the pulse under the conditions of electromagnetically induced transparency in the mechanical system contained in a high quality cavity. We show that the group delay can be controlled by the power of the coupling field. The time delay is negative which corresponds to superluminal light when there is a strong coupling between the nano-oscillator and the cavity.