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Composite au nanostructures for fluorescence studies in visible light.
- Source :
-
Nano letters [Nano Lett] 2010 Mar 10; Vol. 10 (3), pp. 874-9. - Publication Year :
- 2010
-
Abstract
- We present results from composite plasmonic nanostructures designed to achieve the cascaded enhancement of electromagnetic fields at optical frequencies. Our structures comprise a small metallic nanodisc suspended above a larger disk. We probe the optical properties of these structures by coating them with a layer of a visible-light fluorophore and observing fluorescence signals with the help of scanning confocal microscopy. A 43 +/- 5-fold increase in the far-field fluorescence signal has been observed for two-tier composite nanostructures, when compared to the signal obtained from individual nanodiscs. Our results offer the prospect of using such nanostructures for field concentration, optical manipulation of nanoobjects, chemical and biological sensing.
- Subjects :
- Crystallization methods
Light
Macromolecular Substances chemistry
Materials Testing
Molecular Conformation
Particle Size
Surface Properties
Gold chemistry
Nanostructures chemistry
Nanostructures ultrastructure
Nanotechnology methods
Spectrometry, Fluorescence methods
Surface Plasmon Resonance methods
Subjects
Details
- Language :
- English
- ISSN :
- 1530-6992
- Volume :
- 10
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Nano letters
- Publication Type :
- Academic Journal
- Accession number :
- 20143865
- Full Text :
- https://doi.org/10.1021/nl903498h