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Related Experiment Video

Updated: Jun 1, 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

High sensitivity SMS fiber structure based refractometer--analysis and experiment.

Qiang Wu¹, Yuliya Semenova, Pengfei Wang

¹Photonics Research Centre, School of Electronic and Communications Engineering, Dublin Institute of Technology, Dublin, Ireland. qiang.wu@dit.ie

|June 7, 2011

Summary

This summary is machine-generated.

Smaller multimode fiber core diameters significantly enhance the sensitivity of fiber optic refractometers. This study shows core diameter, not length, is key for refractive index sensing performance.

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Area of Science:

Optoelectronics
Fiber Optics
Sensor Technology

Background:

Fiber optic refractometers are crucial for measuring liquid refractive index (RI).
The sensitivity of Surface-Mode-Surface (SMS) fiber refractometers depends on structural parameters.
Optimizing these parameters is essential for improving sensing accuracy.

Purpose of the Study:

To investigate the impact of multimode fiber core (MMFC) diameter and length on SMS fiber refractometer sensitivity.
To determine the optimal MMFC dimensions for enhanced refractive index (RI) sensing.

Main Methods:

Experimental fabrication and testing of SMS fiber refractometers with varying MMFC diameters and lengths.
Numerical simulations to validate experimental findings.
Sensitivity measurements across a specific RI range (1.342 to 1.437).

Main Results:

MMFC diameter significantly influences RI sensitivity; smaller diameters yield higher sensitivity.
MMFC length does not have a significant impact on sensitivity.
A maximum sensitivity of 1815 nm/RIU was achieved with an 80 μm core diameter.
Experimental results closely matched numerical simulation predictions.

Conclusions:

The MMFC diameter is a critical design parameter for optimizing SMS fiber refractometer sensitivity.
Lower MMFC diameters are recommended for developing high-sensitivity refractometers.
The findings provide valuable insights for the design and fabrication of advanced fiber optic sensors.