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Democratizing high-Q plasmonic optical fiber biosensing with low-resolution interrogation and Fourier demodulation
Hadrien Fasseaux1, Médéric Loyez2,3, Christophe Caucheteur2
1Département d'électromagnétisme et télécommunications, Institut des Matériaux, UMons, Mons, Belgium. Hadrien.fasseaux@umons.ac.be.
Communications Engineering
|November 25, 2025
Summary
This study demonstrates cost-effective interrogation of plasmonic fiber sensors using a low-resolution device and fast Fourier transform analysis. This simplifies hardware and computation for biosensing applications.
Area of Science:
- Plasmonics
- Fiber Optics
- Biosensing
Background:
- Gold-coated tilted fiber Bragg gratings are effective plasmonic biosensors.
- High-cost interrogators and complex signal processing limit their deployment.
Purpose of the Study:
- To demonstrate effective interrogation of tilted fiber Bragg gratings sensors using low-cost, coarsely resolved interrogators.
- To reduce hardware and computational requirements for plasmonic fiber sensor systems.
Main Methods:
- Utilized a low-resolution fiber Bragg grating interrogator (256 pixels, 45 nm span).
- Applied fast Fourier transform-based demodulation to the cladding mode spectrum.
- Validated the approach using refractometry and biosensing of Proteinase 3.
Main Results:
- Achieved robust sensing information extraction from a narrow spectral window.
- Preserved high sensitivity despite coarse interrogator resolution.
- Successfully compensated for temperature cross-sensitivity within the narrow spectral range.
Conclusions:
- Developed a method for cost-effective interrogation of plasmonic fiber sensors.
- Enables compact, user-friendly sensor systems for real-world biomedical applications.
- Paves the way for wider deployment of fiber optic biosensors.
