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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

Surface plasmon resonance based fiber optic pH sensor utilizing Ag/ITO/Al/hydrogel layers.

Satyendra K Mishra¹, Banshi D Gupta

¹Physics Department, Indian Institute of Technology Delhi, New Delhi, 110016, India.

|March 15, 2013

Summary

This study presents a novel optical fiber pH sensor utilizing surface plasmon resonance. The sensor demonstrates high sensitivity and accuracy for pH detection, with minimal temperature influence and practical advantages like reusability.

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Last Updated: May 13, 2026

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Area of Science:

Optoelectronics
Chemical Sensing
Materials Science

Background:

Optical fiber sensors offer advantages for remote and in-situ measurements.
Surface Plasmon Resonance (SPR) is a label-free technique sensitive to refractive index changes.
Smart hydrogels exhibit volume transitions in response to environmental stimuli like pH.

Purpose of the Study:

To fabricate and characterize a novel SPR-based optical fiber pH sensor.
To optimize sensor performance by tuning layer thicknesses.
To evaluate sensor sensitivity, accuracy, and response to pH variations.

Main Methods:

Fabrication of an optical fiber sensor with silver, Indium Tin Oxide (ITO), and aluminum coatings.
Preparation of a smart hydrogel layer via dip-coating.
Utilizing a wavelength interrogation technique for SPR analysis.
Optimization of ITO and aluminum layer thicknesses.

Main Results:

The sensor demonstrated high sensitivity and detection accuracy for pH changes.
Increasing pH induced hydrogel swelling, decreasing refractive index and causing a blue shift in resonance wavelength.
Optimized ITO and aluminum layers enhanced sensor performance.
Negligible impact of ambient temperature (25-45 °C) on sensor performance.

Conclusions:

The developed SPR optical fiber sensor offers a sensitive, accurate, and cost-effective solution for pH monitoring.
The sensor exhibits a fast response time, reusability, and potential for miniaturization and remote sensing applications.
This technology represents a significant advancement in optical sensing for environmental and biomedical applications.