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Updated: Apr 26, 2026

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Fiber-optic evanescent wave sensor with a segmented structure.

Jun Lou, Hong-zhi Xu, Ben Xu

|August 5, 2014

Summary

This summary is machine-generated.

A novel segmented optic fiber sensor demonstrates enhanced sensitivity for detecting substances. This new design, based on evanescent wave absorption, offers a robust and efficient method for material spectrum measurements.

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Area of Science:

Optoelectronics
Chemical Sensing
Fiber Optics

Background:

Evanescent wave absorption is a key principle in optical sensing.
Conventional single straight fiber optic sensors have limitations in sensitivity and robustness.
Segmented structures offer potential for enhanced evanescent field-matter interaction.

Purpose of the Study:

To propose and demonstrate a segmented structure optic fiber sensor.
To investigate the impact of structural parameters on sensor sensitivity.
To compare the performance of the segmented sensor with conventional designs.

Main Methods:

Simulating waveguide modes using the beam propagation method.
Experimentally investigating the effect of segment number and core diameter.
Testing sensor sensitivity with varying concentrations of methylene blue solution.

Main Results:

High-order modes are repeatedly excited in the segmented structure.
The segmented sensor exhibits approximately two times higher sensitivity (∼0.0476 L/g) than conventional sensors.
Absorbance shows a linear relationship with the number of segments and inverse relationship with residue core diameter.

Conclusions:

The proposed segmented optic fiber sensor offers significantly improved sensitivity and robustness.
The sensor's performance aligns with theoretical and simulation predictions.
This sensor is well-suited for sensitive material spectrum measurements.