期刊
OPTICS EXPRESS
卷 22, 期 18, 页码 22018-22030出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.22.022018
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资金
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0001085]
- Wei Family Private Foundation
- EPSRC [EP/J018473/1]
- Engineering and Physical Sciences Research Council [EP/J018473/1] Funding Source: researchfish
- EPSRC [EP/J018473/1] Funding Source: UKRI
We theoretically investigate the fluorescence enhancement of a molecule placed in a variable (4 - 20 nm) gap of a plasmonic dimer, with different dye molecules as well as different nanoparticle geometries, using a fully vectorial three-dimensional finite-difference time-domain (3D FDTD) method. This work extends previous studies on molecular fluorescence in the vicinity of metal interfaces and single nanoparticles and shows how the radiative emission of a molecule can be further enhanced by engineering the geometry of a plasmonic structure. Through the use of rigorous 3D FDTD calculations, in conjunction with analytic guidance based on temporal coupled-mode (TCM) theory, we develop a design procedure for antennae assemblies that is useful both for general understanding of molecule-metal structure interaction and experimental efforts in plasmon-enhanced molecular spectroscopy. (C) 2014 Optical Society of America
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