Doubly-resonant-cavity electromagnetically induced transparency

TL;DR

This paper demonstrates a doubly-resonant cavity system that enhances electromagnetically induced transparency, enabling efficient optical switching and frequency manipulation with potential applications in signal storage and frequency conversion.

Contribution

It introduces a novel experimental setup for doubly-resonant cavity EIT and develops a theoretical model for three-wave mixing in this system.

Findings

Enhanced control power due to cavity resonance.

Achieved all-optical switching at lower laser power.

Predicted and demonstrated non-Hermitian physics effects.

Abstract

We present an experimental study on the cavity-atom ensemble system, and realize the doubly-resonant cavity enhanced electromagnetically induced transparency, where both the probe and control lasers are resonant with a Fabry-Perot cavity. We demonstrate the precise frequency manipulating of the hybrid optical-atomic resonances, through either temperature or cavity length tuning. In such a system, the control power can be greatly enhanced due to the cavity, and all-optical switching is achieved with a much lower control laser power compared to previous studies. A new theoretical model is developed to describe the effective three-wave mixing process between spin-wave and optical modes. Interesting non-Hermitian physics are predicted theoretically and demonstrated experimentally. Such a doubly-resonant cavity-atom ensemble system without a specially designed cavity can be used for future applications, such as optical signal storage and microwave-to-optical frequency conversion.