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Dual-Mode Comb Plasmonic Optical Fiber Sensing.

Efraín Villatoro1,2, Médéric Loyez3, Joel Villatoro4,5,6

  • 1Department of Electronics, Carleton University, Ottawa, Ontario K1S 5B6, Canada.

ACS Sensors
|June 12, 2024
PubMed
Summary
This summary is machine-generated.

Partially metal-coated fiber Bragg gratings simplify biosensing by enabling dual-comb resonances. This novel approach eliminates polarization control and reduces bandwidth needs while maintaining high refractometric accuracy for plasmonic sensing.

Keywords:
fiber optic sensorspartial metal layerplasmonicsrefractometrysurface plasmon resonancetilted fiber Bragg gratings

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Area of Science:

  • Photonics and optical sensing
  • Nanotechnology and surface science
  • Biomedical engineering and biosensing

Background:

  • Surface plasmon (SP) excitation in metal-coated tilted fiber Bragg gratings (TFBGs) is crucial for sensitive biosensing.
  • Conventional methods require precise polarization control and broad spectral interrogation (C + L bands).
  • These limitations hinder practical applications of TFBG-based plasmonic sensors.

Purpose of the Study:

  • To develop a simplified and robust platform for surface plasmon resonance (SPR) biosensing.
  • To overcome the limitations of polarization dependency and broad spectral interrogation in TFBG sensors.
  • To enhance the practical utility of plasmonic sensing technology.

Main Methods:

  • Fabrication of TFBGs with a partial metal layer coating.
  • Utilizing dual-comb resonances (SP-active and reference modes) in unpolarized transmission spectra.
  • Employing statistical averaging over multiple resonances within a narrowband window for refractometric accuracy.

Main Results:

  • Generation of dual-comb resonances from partially coated TFBGs.
  • Identification of highly sensitive (TM/EH) and insensitive (TE/HE) mode families.
  • Demonstration of wavelength and power referencing using interleaved insensitive modes.
  • Maintained refractometric accuracy with reduced fabrication and measurement complexity.
  • Elimination of the need for polarization control and narrow bandwidth interrogation (10 nm window).

Conclusions:

  • Partially coated TFBGs offer a simplified and more practical approach to plasmonic biosensing.
  • The dual-comb resonance strategy effectively addresses key limitations of previous TFBG sensor designs.
  • This innovation represents a significant advancement for the field of highly sensitive biosensing.