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Related Experiment Video

Updated: Jun 22, 2026

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

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Published on: March 13, 2013

Optical liquid ring resonator sensor.

M Sumetsky, R S Windeler, Y Dulashko

|June 25, 2009

Summary

This summary is machine-generated.

This study presents a sensitive optical microsensor for measuring liquid refractive index. The device utilizes whispering gallery modes in a polymer matrix, offering potential for lab-on-a-chip applications.

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Area of Science:

Photonics and Materials Science
Optical Microsensors
Biomedical Engineering

Background:

Refractive index sensing is crucial for chemical and biological analysis.
Existing methods often require complex sample handling or are not easily miniaturized.
Development of robust, high-sensitivity, and miniaturized sensors is needed.

Purpose of the Study:

To demonstrate a novel optical microsensor for precise refractive index measurements of liquids.
To investigate the use of whispering gallery modes for sensing in microfluidic channels.
To assess the sensor's sensitivity and potential for integration into lab-on-a-chip devices.

Main Methods:

Fabrication of a polymer-based optical microsensor with an integrated microfluidic channel (~100 µm radius).
Excitation of whispering gallery modes (WGMs) in the polymer matrix using an embedded optical microfiber.
Measurement of the transmission spectrum of WGMs to detect changes in the liquid's refractive index.

Main Results:

The optical microsensor demonstrated high responsiveness to changes in liquid refractive index.
A sensitivity of 800 nm/RIU (nanometers per refractive index unit) was achieved.
The sensor design allows for the excitation of WGMs across the liquid channel.

Conclusions:

The developed optical microsensor is robust and highly sensitive for refractive index probing.
The technology is suitable for integration into lab-on-a-chip systems for various analytical applications.
This approach offers a straightforward method for creating miniaturized optical sensing elements.