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Optimization of Magnetoplasmonic Behavior in Ag/Fe Bilayer Nanostructures Towards Refractometric Sensing
João Pedro Miranda Carvalho1,2, Bernardo S Dias3, Luís C C Coelho1,2
1Centre for Applied Photonics, INESC TEC-Institute for Systems and Computer Engineering, Technology and Science, 4150-179 Porto, Portugal.
Sensors (Basel, Switzerland)
|March 17, 2025
Summary
This study introduces a novel cobalt-free silver/iron (Ag/Fe) bilayer for magneto-optic surface plasmon resonance (MOSPR) sensing. The optimized structure enhances refractometric sensitivity through magneto-optical modulation, offering a safer alternative for chemical and biosensors.
Area of Science:
- Plasmonics
- Magneto-optics
- Nanomaterials
Background:
- Magneto-optic surface plasmon resonances (MOSPRs) utilize magnetic fields to modulate plasmonic bands and enhance magneto-optical activity.
- Surface plasmon polaritons (SPPs) are key to MOSPR phenomena.
Purpose of the Study:
- To investigate the magnetoplasmonic behavior of Ag/Fe bilayers for refractometric sensing.
- To optimize and fabricate a cobalt-free Ag/Fe bilayer structure for enhanced sensing capabilities.
Main Methods:
- VIS-NIR spectroscopy and SQUID measurements were used to characterize Ag/Fe thin-film samples.
- Berreman's matrix formalism was employed for simulating MOSPR sensing properties.
- Fabrication and characterization of the optimized Ag/Fe bilayer structure.
Main Results:
- An optimized Ag/Fe bilayer structure (15 nm Ag/12.5 nm Fe) was identified through simulations.
- The fabricated structure achieved a refractive index (RI) sensitivity of 4946 RIU-1.
- Magneto-optical modulation effectively enhanced refractometric sensitivity.
Conclusions:
- A novel, cobalt-free Ag/Fe bilayer structure was successfully developed for refractometric sensing.
- This configuration demonstrates potential for enhanced sensitivity via magneto-optical modulation.
- The Ag/Fe bilayer offers a simpler, safer, and more accessible platform for chemical and biosensors.
