期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 13, 期 9, 页码 3831-3838出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0cp01986k
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资金
- University of Maryland Baltimore County
- Institute of Fluorescence
- NIH NIBIB [5-U54-EB007958-04, 5-U54-EB007949, 5-U54-EB007959, 5-U54-EB007954]
- NATIONAL INSTITUTE OF BIOMEDICAL IMAGING AND BIOENGINEERING [U54EB007954, U54EB007958, U54EB007949, U54EB007959] Funding Source: NIH RePORTER
Metal-Enhanced Fluorescence (MEF) effects from different density silver island films (SiFs) and the effects of far-field excitation irradiance on the observed enhancement of fluorescence were studied. It is shown that MEF non-linearly depends on silver nanoparticle (NP) size/density, reaching a maximum value for SiFs made at a deposition time (DT) of similar to 5 minutes, i.e. just before SiFs become continuous. Numerical simulations of the silver-islands growing on glass revealed that the near-field magnitude depends non-linearly on size and interparticle distance exhibiting dramatic enhancement at similar to 10 nm distance between the NPs. In addition, a remarkable effect of modulation in MEF efficiency by far-field excitation irradiance has been observed, which can be correlated well with numerical simulations that show an excitation power volume dependence. The near-field volume changes non-linearly with far-field power. This unique observation has profound implications in MEF, which has rapidly emerged as a powerful tool in the biosciences and ultimately allows for tunable fluorescence enhancement factors.
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