Nanofiber-segment ring resonator

TL;DR

This paper introduces a fiber ring resonator with a nanofiber segment that enhances atom-light interactions via evanescent fields, demonstrating potential for strong coupling in cavity QED applications.

Contribution

The paper presents a novel nanofiber-segment ring resonator design and experimental results with warm atomic vapor, highlighting its potential for advanced quantum optics.

Findings

Demonstrated interaction between cavity field and atoms near nanofiber surface

Achieved low-finesse cavity with observable atom-light coupling

Discussed prospects for strong coupling regime with trapped atoms

Abstract

We describe a fiber ring resonator comprised of a relatively long loop of standard single-mode fiber with a short nanofiber segment. The evanescent mode of the nanofiber segment allows the cavity-enhanced field to interact with atoms in close proximity to the nanofiber surface. We report on an experiment using a warm atomic vapor and low-finesse cavity, and briefly discuss the potential for reaching the strong coupling regime of cavity QED by using trapped atoms and a high-finesse cavity of this kind.