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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
Published on: December 11, 2013
Plasmon line shaping using nanocrosses for high sensitivity localized surface plasmon resonance sensing
Niels Verellen1, Pol Van Dorpe, Chengjun Huang
1INPAC-Institute for Nanoscale Physics and Chemistry, K U Leuven, Leuven, Belgium. niels.verellen@fys.kuleuven.be
Nano Letters
|January 27, 2011
Summary
We developed high-quality gold plasmonic nanocavities for enhanced biomarker detection. Our novel design significantly improves sensitivity and sensing volume, achieving high figures of merit for label-free biosensing applications.
Area of Science:
- Plasmonics
- Nanophotonics
- Biosensing
Background:
- Localized surface plasmon resonances (LSPRs) in metal nanostructures enable label-free biomarker detection.
- Practical applications are limited by broad spectral widths due to radiative damping in nanocavities.
Purpose of the Study:
- To fabricate high-quality plasmonic nanocavities with reduced radiative damping.
- To enhance sensing volume and sensitivity through substrate etching.
- To generate high-quality factor subradiant Fano resonances for improved sensing performance.
Main Methods:
- Tailored design and reproducible nanofabrication of planar gold plasmonic nanocavities.
- Substrate etching to increase sensing volume.
- Coherent coupling of bright and dark plasmon modes in nanocross and nanobar structures.
Main Results:
- Fabrication of gold plasmonic nanocavities with significantly reduced radiative damping.
- Demonstration of enhanced sensing volume and sensitivity.
- Achieved high-quality factor subradiant Fano resonances with experimental sensitivities exceeding 1000 nm/RIU and a Figure of Merit of 5.
Conclusions:
- The developed nanocavities offer superior performance for label-free biosensing.
- The strategy of reducing radiative damping and enhancing sensing volume is effective.
- High-quality factor Fano resonances enable highly sensitive detection.
