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Optical Sensitivity Gain in Silica-Coated Plasmonic Nanostructures
Francesco Floris1, Cristiana Figus2, Lucia Fornasari1
1†Dipartimento di Fisica, Università degli Studi di Pavia, Via Bassi 6, I-27100 Pavia, Italy.
The Journal of Physical Chemistry Letters
|August 18, 2015
Summary
Ultrathin silica films enhance plasmonic nanostructures, significantly boosting sensitivity for refractive index sensing. This advancement offers a 50% increase in sensitivity for detecting changes in aqueous solutions.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Plasmonic nanostructures are crucial for sensing applications.
- Tuning plasmon resonance and sensitivity is key for improved performance.
Purpose of the Study:
- To investigate the effect of ultrathin silica films on plasmonic nanostructures.
- To enhance the sensitivity of plasmonic sensors for refractive index changes.
Main Methods:
- Sol-gel synthesis and dip-coating techniques for silica film deposition.
- Fabrication of predefined metal/polymer plasmonic nanostructures.
- Optical characterization and numerical simulations.
Main Results:
- Achieved plasmon resonance spectral shifts up to 100 nm.
- Increased sensitivity by over 50% in the ultrathin silica layer regime (<10 nm).
- Demonstrated slope efficiencies of ~8 nm/nm with increasing layer thickness.
Conclusions:
- Ultrathin silica films effectively tune plasmonic resonance modes.
- Silica coatings significantly enhance plasmonic sensor sensitivity to refractive index.
- Numerical simulations validated experimental findings and guided sensor design.
