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Plasmon-Enhanced Fluorescence Biosensors: a Review
Martin Bauch1, Koji Toma2, Mana Toma2
1AIT-Austrian Institute of Technology GmbH, Muthgasse 11, Vienna, 1190 Austria.
Plasmonics (Norwell, Mass.)
|June 23, 2016
Summary
Metal-enhanced fluorescence (MEF) amplifies signals from fluorescent labels on metallic nanostructures. This boosts sensitivity and speed for detecting biomarkers, toxins, and pathogens in diagnostics and food safety.
Area of Science:
- Nanotechnology
- Biophysics
- Analytical Chemistry
Background:
- Metallic nanostructures confine electromagnetic fields via surface plasmons.
- This confinement enhances fluorescence from nearby organic dyes and quantum dots.
- Enhanced fluorescence amplifies signals in molecular detection assays.
Purpose of the Study:
- To review the fundamentals of plasmon-enhanced fluorescence (PEF).
- To illustrate developments in metallic nanostructures for fluorescence amplification.
- To summarize PEF applications in biosensors for trace analyte detection.
Main Methods:
- Coupling electromagnetic fields to propagating and localized surface plasmons.
- Designing metallic nanostructures for efficient fluorescence signal amplification.
- Utilizing enhanced fluorescence for sensitive detection of analytes.
Main Results:
- Surface plasmons significantly enhance fluorescence intensity and quantum yield.
- Plasmon-enhanced fluorescence (PEF), or metal-enhanced fluorescence (MEF), amplifies signals by orders of magnitude.
- PEF enables increased sensitivity and reduced detection times.
Conclusions:
- PEF/MEF is a powerful technique for enhancing fluorescence-based analytical methods.
- Metallic nanostructures offer efficient signal amplification for biosensing.
- PEF-based biosensors are valuable for medical diagnostics and food safety analysis.
