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Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications

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Composite au nanostructures for fluorescence studies in visible light.

V G Kravets¹, G Zoriniants, C P Burrows

¹School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UK.

|February 11, 2010

Summary

We developed composite plasmonic nanostructures that significantly boost light-matter interactions. These structures show a 43-fold increase in fluorescence, enabling advanced applications in sensing and optical manipulation.

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Area of Science:

Plasmonics
Nanophotonics
Optical Engineering

Background:

Plasmonic nanostructures are crucial for manipulating light at the nanoscale.
Cascaded enhancement of electromagnetic fields is key for improving optical phenomena.
Controlling field localization in composite nanostructures remains a challenge.

Purpose of the Study:

To design and investigate composite plasmonic nanostructures for cascaded electromagnetic field enhancement.
To quantify the fluorescence enhancement achieved by these novel nanostructures.
To explore potential applications in sensing and optical manipulation.

Main Methods:

Fabrication of two-tier composite nanostructures (small nanodisc over larger disk).
Coating nanostructures with visible-light fluorophores.
Probing optical properties using scanning confocal microscopy and fluorescence measurements.

Main Results:

Observed a significant 43 ± 5-fold increase in far-field fluorescence signal for composite nanostructures compared to individual nanodiscs.
Demonstrated cascaded enhancement of electromagnetic fields at optical frequencies.
Validated the effectiveness of the designed nanostructures for signal amplification.

Conclusions:

Composite plasmonic nanostructures effectively achieve cascaded electromagnetic field enhancement.
The observed fluorescence enhancement opens possibilities for advanced optical applications.
These nanostructures show promise for applications in field concentration, optical manipulation, and chemical/biological sensing.