Hollow Core, Whispering Gallery Resonator Sensors

TL;DR

This paper reviews hollow core whispering gallery resonators, detailing their modes, fabrication, and applications in sensing and lasing, providing a comprehensive overview of current advancements and key research in the field.

Contribution

It offers a comprehensive review of hollow core WGRs, including fabrication techniques, sensing mechanisms, and diverse applications, highlighting recent progress and key literature.

Findings

Hollow core WGRs are effective for refractive index and temperature sensing.

Microbubble and microcapillary fabrication methods are discussed.

Applications include gas sensing, force sensing, biosensing, and lasing.

Abstract

A review of hollow core whispering gallery resonators (WGRs)is given. After a short introduction to the topic of whispering gallery resonators we provide a description of whispering gallery modes in hollow or liquid core WGRs. Next, whispering gallery mode (WGM) sensing mechanisms are outlined and some fabrication methods for microbubbles, microcapillaries and other tubular WGM devices are discussed. We then focus on the most common applications of hollow core WGRs, namely refractive index and temperature sensing, gas sensing, force sensing, biosensing, and lasing. The review highlights some of the key papers in this field and gives the reader a general overview of the current state-of-the-art.