Meng, X; Grote, RR; Osgood, RM; Dadap, JI; Panoiu, NC; (2014) Engineering metal-nanoantennae/dye complexes for maximum fluorescence enhancement. Optics Express , 22 (18) 22018 - 22030. 10.1364/OE.22.022018.

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Abstract

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.

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