Fabry-P\'erot Cavity Formed with Dielectric Metasurfaces in a Hollow-Core Fiber

TL;DR

This paper presents a novel fiber-integrated Fabry-Pérot cavity using dielectric metasurfaces on hollow-core fibers, enabling potential advancements in fiber lasers, gas spectroscopy, and nonlinear optics.

Contribution

Introduction of a fiber-integrated Fabry-Pérot cavity with dielectric metasurfaces acting as planar mirrors on hollow-core fibers, allowing gas injection and improved optical properties.

Findings

Cavity with finesse of ~11 achieved

Q factor of ~$4.5 imes 10^5 demonstrated

Potential for higher finesse with better fabrication

Abstract

We demonstrate a fiber-integrated Fabry-P\'erot cavity formed by attaching a pair of dielectric metasurfaces to the ends of a hollow-core photonic-crystal fiber segment. The metasurfaces consist of perforated membranes designed as photonic-crystal slabs that act as planar mirrors but can potentially allow injection of gases through their holes into the hollow core of the fiber. We have so far observed cavities with finesse of ~11 and Q factors of ~$4.5 \times 10^5$, but much higher values should be achievable with improved fabrication procedures. We expect this device to enable development of new fiber lasers, enhanced gas spectroscopy, and studies of fundamental light-matter interactions and nonlinear optics.