TY - JOUR
T1 - Electrodynamic calculations of spontaneous emission coupled to metal nanostructures of arbitrary shape : nanoantenna-enhanced fluorescence
AU - Giannini, V.
AU - Sánchez-Gil, J.A.
AU - Muskens, O.L.
AU - Gómez Rivas, J.
PY - 2009
Y1 - 2009
N2 - We present a theoretical study of the spontaneous emission of an optical emitter close to a metal nanostructure of arbitrary shape. The modification of the corresponding radiative and nonradiative decay rates and resulting quantum efficiencies, expressed on the basis of a semiclassical dipole model in terms of the local plasmonic mode density, is calculated by means of the rigorous formulation of the Green’s theorem surface integral equations. Metal losses and the intrinsic nonradiative decay rate of the molecules are properly considered, presenting relationships valid in general for arbitrary intrinsic quantum yields. Resonant enhancement of the radiative and nonradiative decay rates of a fluorescent molecule is observed when coupled to an optical dimer nanoantenna. Upon varying the dipole position, it is possible to obtain a predominant enhancement of radiative decay rates over the nonradiative counterpart, resulting in an increase of the internal quantum efficiency. For emitters positioned in the gap, quantum efficiency enhancements from an intrinsic value of 1% to ~75% are possible.
AB - We present a theoretical study of the spontaneous emission of an optical emitter close to a metal nanostructure of arbitrary shape. The modification of the corresponding radiative and nonradiative decay rates and resulting quantum efficiencies, expressed on the basis of a semiclassical dipole model in terms of the local plasmonic mode density, is calculated by means of the rigorous formulation of the Green’s theorem surface integral equations. Metal losses and the intrinsic nonradiative decay rate of the molecules are properly considered, presenting relationships valid in general for arbitrary intrinsic quantum yields. Resonant enhancement of the radiative and nonradiative decay rates of a fluorescent molecule is observed when coupled to an optical dimer nanoantenna. Upon varying the dipole position, it is possible to obtain a predominant enhancement of radiative decay rates over the nonradiative counterpart, resulting in an increase of the internal quantum efficiency. For emitters positioned in the gap, quantum efficiency enhancements from an intrinsic value of 1% to ~75% are possible.
U2 - 10.1364/JOSAB.26.001569
DO - 10.1364/JOSAB.26.001569
M3 - Article
SN - 0740-3224
VL - 26
SP - 1569
EP - 1577
JO - Journal of the Optical Society of America B: Optical Physics
JF - Journal of the Optical Society of America B: Optical Physics
IS - 8
ER -