Optomechanically Induced Transparency at Exceptional Points

TL;DR

This paper explores how exceptional points in a nanoparticle-coupled microresonator can be used to control light transmission and delay, enabling tunable slow-to-fast light switching for optical applications.

Contribution

It introduces a method to engineer optomechanical devices utilizing exceptional points for enhanced control over light transmission and delay.

Findings

Exceptional points periodically emerge by tuning nanoparticle angles.

Transmission rate and group delay are strongly modified at EPs.

Controllable switching between slow and fast light is demonstrated.

Abstract

We study optomechanically induced transparency in a microresonator coupled with nanoparticles. By tuning the relative angle of the nanoparticles, exceptional points (EPs) emerge periodically in this system and thus strongly modify both the transmission rate and the group delay of the signal. As a result, controllable slow-to-fast light switching can be achieved by manipulating external nanoparticles. This provides a new way to engineer EP-assisted optomechanical devices for applications in optical communications and signal processing.