Optomechanically-Induced Transparency in partiy-time-symmetric microresonators

TL;DR

This paper explores optomechanically-induced transparency in PT-symmetric microresonators, revealing a reversed transparency effect and enabling control over light speed, which advances nanoscale photonic device functionalities.

Contribution

It introduces the concept of inverted-OMIT in PT-symmetric microresonators and demonstrates control over light propagation by tuning gain-loss ratios and pump power.

Findings

Reversal of transparency in PT-symmetric microresonators

Transition from slow to fast light by tuning system parameters

Observation of PT-phase transition effects on light transmission

Abstract

Optomechanically-induced transparency (OMIT) and the associated slowing of light provide the basis for storing photons in nanoscale devices. Here we study OMIT in parity-time (PT)-symmetric microresonators with a tunable gain-to-loss ratio. This system features a reversed, non-amplifying transparency, i.e., an inverted-OMIT. When the gain-to-loss ratio is varied, the system exhibits a transition from a PT-symmetric phase to a broken-PT-symmetric phase. This PT-phase transition results in the reversal of the pump and gain dependence of the transmission rates. Moreover, we show that by tuning the pump power at a fixed gain-to-loss ratio, or the gain-to-loss ratio at a fixed pump power, one can switch from slow to fast light and vice versa. These findings provide new tools for controlling light propagation using nanofabricated phononic devices.