Related Experiment Video
Updated: Jun 17, 2026
08:48
Writing Bragg Gratings in Multicore Fibers
Published on: April 20, 2016
Theoretical analysis of a fiber optic surface plasmon resonance sensor utilizing a Bragg grating
Barbora Spacková1, Jirí Homola
1Institute of Photonics and Electronics ASCR v.v.i., Chaberská 57, Prague, Czech Republic.
Optics Express
|January 7, 2010
Summary
This study presents a theoretical analysis of a fiber optic surface plasmon resonance sensor. The novel sensor design achieves a high refractive index resolution for analyte detection.
Area of Science:
- Photonics
- Nanotechnology
- Spectroscopy
Background:
- Surface plasmon resonance (SPR) sensors offer high sensitivity for detecting refractive index changes.
- Fiber optic sensors provide a robust platform for remote and miniaturized sensing applications.
Purpose of the Study:
- To theoretically analyze a novel fiber optic SPR sensor.
- To investigate the excitation of mixed surface plasmon-fiber cladding modes.
- To determine the potential of this sensor for high-resolution refractive index measurements.
Main Methods:
- Coupled Mode Theory was employed to calculate the transmission spectrum.
- A 3-D field expansion approach was used for modal structure analysis.
- Analysis focused on the coupling between the fundamental fiber mode and plasmon-cladding modes via a Bragg grating.
Main Results:
- The theoretical model predicted narrow transmission dips corresponding to the excitation of mixed modes.
- The sensitivity of these dips to analyte refractive index changes was calculated.
- A refractive index resolution better than 2 x 10⁻⁶ RIU was estimated.
Conclusions:
- The proposed fiber optic SPR sensor design is theoretically validated.
- The sensor demonstrates potential for highly sensitive and precise refractive index sensing.
- This work paves the way for advanced optical sensing technologies.
