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Related Experiment Video

Updated: May 27, 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

Refractometric sensing with fluorescent-core microcapillaries.

C P K Manchee¹, V Zamora, J W Silverstone

¹Department of Physics, University of Alberta, Edmonton, AB, Canada.

|November 24, 2011

Summary

This summary is machine-generated.

This study introduces a novel capillary-based microfluidic sensor using fluorescent silicon quantum dots to detect refractive index changes. The whispering gallery mode sensor achieved a sensitivity of 9.8 nm/RIU, with potential for higher performance.

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Last Updated: May 27, 2026

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

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Published on: December 2, 2017

Area of Science:

Optics and Photonics
Materials Science
Microfluidics

Background:

Capillary structures offer potential for microfluidic refractive index sensing.
Whispering gallery mode (WGM) resonances are sensitive to changes in the surrounding medium's refractive index.

Purpose of the Study:

To demonstrate a capillary-type fluorescent core microcavity sensor.
To investigate the use of silicon quantum dots (QDs) for WGM resonance enhancement in microfluidic applications.

Main Methods:

A microcapillary coated with fluorescent silicon QDs was fabricated.
Sucrose solutions were flowed through the capillary, and fluorescence WGM spectra were measured.
Optical modeling was used to analyze the electric field confinement and resonance behavior.

Main Results:

The sensor exhibited WGM resonances in its fluorescence spectrum due to the QD layer.
A refractometric sensitivity of 9.8 nm/RIU (up to 13.8 nm/RIU) was achieved.
A maximum detection limit of approximately 7.2 x 10(-3) RIU was determined.

Conclusions:

The developed capillary microcavity sensor effectively utilizes WGM resonances for refractive index sensing.
Optimization of QD film thickness could significantly enhance sensor sensitivity and detection limits, potentially reaching 100 nm/RIU and 10(-5) RIU, respectively.