Transient Microcavity Sensor

TL;DR

This paper proposes a high-sensitivity, transient microcavity sensor capable of ultrafast environmental detection, demonstrated through nanoparticle interaction monitoring, with potential applications in dynamic sensing.

Contribution

It introduces a novel transient sensing method based on high-Q microcavities, enabling ultrafast detection of environmental changes and nanoparticle dynamics.

Findings

Sensor can detect nanoparticle coupling, speed, and size.

Transient response provides ultrafast environmental information.

Method enhances sensitivity over traditional static sensors.

Abstract

A transient and high sensitivity sensor based on high-Q microcavity is proposed and studied theoretically. There are two ways to realize the transient sensor: monitor the spectrum by fast scanning of probe laser frequency or monitor the transmitted light with fixed laser frequency. For both methods, the non-equilibrium response not only tells the ultrafast environment variance, but also enable higher sensitivity. As examples of application, the transient sensor for nanoparticles adhering and passing by the microcavity is studied. It's demonstrated that the transient sensor can sense coupling region, external linear variation together with the speed and the size of a nanoparticle. We believe that our researches will open a door to the fast dynamic sensing by microcavity.