Research Papers

Plasmonic platforms of self-assembled silver nanostructures in application to fluorescence

[+] Author Affiliations
Rafal Luchowski, Nils Calander

University of North Texas Health Science Center, Department of Molecular Biology and Immunology, Center for Commercialization of Fluorescence Technologies, Fort Worth, Texas 76107

Tanya Shtoyko

University of Texas at Tyler, Tyler, Texas 75799

Elisa Apicella, Julian Borejdo, Zygmunt Gryczynski, Ignacy Gryczynski

University of North Texas Health Science Center, Department of Molecular Biology and Immunology, Center for Commercialization of Fluorescence Technologies, Fort Worth, Texas 76107

J. Nanophoton. 4(1), 043516 (September 22, 2010). doi:10.1117/1.3500463
History: Received May 25, 2010; Revised August 5, 2010; Accepted September 17, 2010; September 22, 2010; Online September 22, 2010
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Abstract

Fluorescence intensity changes were investigated theoretically and experimentally using self-assembled colloidal structures on silver semitransparent mirrors. Using a simplified quasi-static model and finite element method, we demonstrate that near-field interactions of metallic nanostructures with a continuous metallic surface create conditions that produce enormously enhanced surface plasmon resonances. The results were used to explain the observed enhancements and determine the optimal conditions for the experiment. The theoretical parts of the studies are supported with reports on detailed emission intensity changes which provided multiple fluorescence hot spots with 2-3 orders of enhancements. We study two kinds of the fluorophores: dye molecules and fluorescent nanospheres characterized with similar spectral emission regions. Using a lifetime-resolved fluorescence/reflection confocal microscopy technique, we find that the largest rate for enhancement (~1000-fold) comes from localized areas of silver nanostructures.

© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Rafal Luchowski ; Nils Calander ; Tanya Shtoyko ; Elisa Apicella ; Julian Borejdo, et al.
"Plasmonic platforms of self-assembled silver nanostructures in application to fluorescence", J. Nanophoton. 4(1), 043516 (September 22, 2010). ; http://dx.doi.org/10.1117/1.3500463


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