Abstract
In this article, we experimentally investigated the plasmonics interaction in the system composed of Ag nano-cubes on Ag film with controlled distance. The distance is controlled by Rhodamine B (RhB)-doped polymethylmethacrylate (PMMA) film as the spacer, whose fluorescence intensity was then enhanced by the plasmonics interaction. Experimental results show that the fluorescence enhancement is sensitive to the thickness of the spacer. The largest enhancement factor obtained is 521 with the RhB-doped PMMA film of 10 nm thickness. For comparison, we also presented the fluorescence enhancement caused by only the localized surface plasmons from Ag nano-cubes on glass substrate coated with RhB-doped PMMA film, which gives out lower enhancement factors at the same thick spacer. Our experimental results are consistent with previous theoretical investigation and shows promising applications in fluorescence based bio-sensing or bio-imaging.
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Acknowledgments
This work is supported by the Key Program of National Natural Science Foundation of China under Grant (No. 610360050) and National Natural Science Foundation of China under Grant (No. 10704070, 11074241, 11004182.).
D. G. Zhang acknowledges helpful discussions with Dr. J. R. Lakowicz and Dr. M. H. Chowdhury of the Center for Fluorescence Spectroscopy, University Maryland School of Medicine.
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Yi, M., Zhang, D., Wen, X. et al. Fluorescence Enhancement Caused by Plasmonics Coupling Between Silver Nano-Cubes and Silver Film. Plasmonics 6, 213–217 (2011). https://doi.org/10.1007/s11468-010-9190-3
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DOI: https://doi.org/10.1007/s11468-010-9190-3