Journal
OPTICS LETTERS
Volume 34, Issue 24, Pages 3905-3907Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.34.003905
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Funding
- Korea Science and Engineering Foundation (KOSEF) through the National Core Research Center for Nanomedical Technology [R15-2004-024-00000-0]
- Korea Research Foundation [KRF-2008-331-D00389, NRF-2009-0054064]
- National Research Foundation of Korea [2008-331-D00389, 과06A1503, 2007-0054064] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We investigate optimum plasmon-enhanced total-internal-reflection fluorescence imaging by metallic thin films and nanostructures. The enhancement is based on the mismatch between the conditions of plasmon resonance and maximal near-field intensity. We have calculated plasmon-associated near-field and far-field characteristics using rigorous coupled-wave analysis. Near-field intensity was experimentally measured with fluorescent beads on silver thin films, nanogratings, and nanoislands. The results for nanostructure-based plasmon excitation confirm that momentum mismatching when exciting plasmons can increase the consequent emission of fluorescence substantially. The improvement can be critical depending on the specific structure. (C) 2009 Optical Society of America
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