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Updated: May 18, 2026

$Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing$

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

Published on: March 13, 2013

Ultrasensitive label-free coupled optofluidic ring laser sensor.

Liqiang Ren¹, Xiang Wu, Ming Li

¹Key Laboratory for Micro and Nanophotonic Structures (Ministry of Education), Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai, China.

|October 9, 2012

Summary

This study presents a novel optofluidic ring laser sensor for highly sensitive detection. The device achieves ultrasensitive refractive index and mass sensing, offering a new tool for chemical and biological analysis.

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Area of Science:

Optofluidics
Laser Physics
Biosensing

Background:

Optofluidic ring lasers offer potential for sensitive detection.
Whispering gallery mode coupling can enhance sensor performance.

Purpose of the Study:

To fabricate and demonstrate an ultrasensitive coupled optofluidic ring laser sensor.
To evaluate its bulk refractive index and surface mass sensing capabilities.

Main Methods:

Fabrication of a sensor combining a cylindrical ring laser and an optofluidic capillary ring resonator.
Utilizing the Vernier effect through coupled whispering gallery modes for enhanced sensitivity.

Main Results:

Achieved a sensitivity of 2510 nm/RIU and a magnification factor of 355.
Demonstrated a noise-equivalent detection limit of 1.6×10(-5) RIU for bulk refractive index detection.

Conclusions:

The coupled optofluidic ring laser sensor exhibits ultrasensitive detection properties.
This configuration provides a convenient and effective platform for biological and chemical sensing.