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Related Experiment Video

Updated: Sep 27, 2025

Implementation of a Reference Interferometer for Nanodetection
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A Taper-in-Taper Structured Interferometric Optical Fiber Sensor for Cu2+ ion Detection.

Zidan Gong1, Yisong Lei1, Ziwen Wang1

  • 1Sino German College of Intelligent Manufacturing, Shenzhen Technology University, Shenzhen 518118, China.

Sensors (Basel, Switzerland)
|April 12, 2022
PubMed
Summary

A novel taper-in-taper fiber sensor offers a sensitive, reliable method for detecting copper ions (Cu2+) in drinking water. This cost-effective device overcomes electromagnetic interference challenges, crucial for public health monitoring.

Keywords:
Cu2+ detectioninterferometricoptical fiber sensorrefractive indextaper-in-taper

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Area of Science:

  • Fiber optic sensing
  • Environmental monitoring
  • Analytical chemistry

Background:

  • Copper ions (Cu2+) in drinking water pose health risks.
  • Existing detection methods lack sensitivity, reliability, and cost-effectiveness.
  • Electromagnetic interference is a challenge for current devices.

Purpose of the Study:

  • To develop a highly sensitive, reliable, and cost-effective fiber optic sensor for Cu2+ detection.
  • To overcome limitations of existing copper ion sensors.
  • To create an electromagnetic-interference-immune device for drinking water analysis.

Main Methods:

  • Fabrication of a taper-in-taper fiber sensor using mode-mode interference.
  • Deposition of polyelectrolyte layers for enhanced Cu2+ detection.
  • Utilizing a novel secondary taper structure formed by two-arc discharge in single-mode fiber.

Main Results:

  • The sensor achieved a refractive index (RI) sensitivity of 2741 nm/RIU, 3.7 times higher than traditional tapered sensors.
  • Sensitivity for Cu2+ detection reached 78.03 nm/mM within the 0-0.1 mM concentration range.
  • The taper-in-taper fiber sensor demonstrated high sensitivity, good stability, and mechanical strength.

Conclusions:

  • The developed taper-in-taper fiber sensor is a promising tool for detecting low concentrations of Cu2+ in drinking water.
  • The sensor design offers significant sensitivity enhancement and overcomes electromagnetic interference issues.
  • This technology has potential applications in environmental and health monitoring systems.