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Related Experiment Video

Updated: Jul 27, 2025

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Titanium Nitride Modified Fiber Optic Interferometer for Refractive Index Sensitivity Enhancement.

Duo Yi1, Bin Zhang2, Youfu Geng1

  • 1College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.

Sensors (Basel, Switzerland)
|June 10, 2023
PubMed
Summary

Titanium nitride (TiN) nanoparticles enhance fiber optic interferometers for biosensing. This modification significantly boosts refractive index (RI) response, leading to improved sensitivity and adaptable measurement ranges for advanced biosensing applications.

Keywords:
fiber optic interferometerrefractive index enhancementtitanium nitride

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Titanium nitride (TiN) is a well-established biocompatible transition metal nitride.
  • TiN finds wide application in fiber waveguide coupling devices.
  • Enhancing refractive index (RI) response is crucial for biosensing.

Purpose of the Study:

  • To propose and investigate a TiN-modified fiber optic interferometer.
  • To leverage TiN's unique properties for enhanced biosensing capabilities.
  • To improve the refractive index (RI) response of fiber optic interferometers.

Main Methods:

  • Fabrication of a TiN-modified fiber optic interferometer.
  • Deposition of TiN nanoparticles (NPs) onto the interferometer.
  • Characterization of the interferometer's optical and sensing properties.
  • Analysis of TiN concentration effects on performance.

Main Results:

  • TiN nanoparticles enhanced evanescent field excitation and modulated effective RI difference.
  • The TiN modification significantly improved the interferometer's RI response.
  • Varying TiN concentrations modulated resonant wavelength and RI responses.
  • Enhanced sensitivity and adaptable measurement ranges were achieved.

Conclusions:

  • The TiN-sensitized fiber optic interferometer demonstrates significantly enhanced RI response.
  • This enhancement is attributed to TiN's ultrathin nanolayer, high refractive index, and broad-spectrum optical absorption.
  • The proposed sensor offers flexibly adaptable sensing performances for diverse detection requirements.
  • The TiN-modified interferometer shows potential for high-sensitive biosensing applications.