Double Electromagnetically Induced Transparency and Narrowing of Probe Absorption in a Ring Cavity with Nanomechanical Mirrors

TL;DR

This paper investigates how a strong coupling field affects the absorption and transparency properties of a ring cavity with nanomechanical mirrors, revealing double EIT windows, linewidth narrowing, and suppression of four-wave mixing.

Contribution

It introduces a novel analysis of double electromagnetically induced transparency and linewidth narrowing in a ring cavity with nanomechanical mirrors under strong coupling.

Findings

Double EIT windows with an absorption peak at line center.

Linewidth of the central absorption peak narrows with increased power.

Suppression of four-wave mixing on resonance.

Abstract

We study the effect of a strong coupling field on the absorptive property of a ring cavity with two mirrors oscillating at slightly different frequencies to a weak probe field. We observe double electromagnetically induced transparency windows separated by an absorption peak at line center in the output probe field under the action of a strong coupling field. We find that increasing driving power can broaden the two transparency windows, which results in narrowing of the central absorption peak. At high driving power, the linewidth of the sharp central absorption peak is approximately equal to the mechanical linewidth. We show the normal mode splitting in both the output probe field and the generated Stokes field. We also find that the suppression of the four-wave mixing process can be achieved on resonance.