Journal
NANOTECHNOLOGY
Volume 23, Issue 22, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/23/22/225301
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Funding
- Defense Advanced Research Program Agency (DARPA)
- National Science Foundation (NSF)
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Using a new nanoplasmonic architecture and an optimized spacer, we observed the following: (a) the average fluorescence of an infrared dye (indocyanine green) is enhanced by 2970 fold uniformly (variation < 11%) over a large sample area and over a wide range of dye concentrations (380 to 380 000 molecule mu m(-2)), laser excitation powers and laser beam sizes; and (b) for a single molecule placed at a 'hot spot', the fluorescence enhancement is 4.5 x 10(6) fold. The giant and uniform enhancements (orders of magnitude higher than before), plus easy and inexpensive large area fabrication (>4 '' wafers), should open up wide applications.
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