Figure 1

(Color online) (a) Electron-microscopic image and sample makeup of our resonant and off-resonant gold disk samples. All size parameters: $\pm 3\mathrm{nm}$. (b) Emission spectrum of EuTTA fluorophore (solid line), absorbance spectra of resonant (dashed line), and off-resonant disks (dotted line). All wavelengths: $\pm 3\mathrm{nm}$.Reuse & Permissions

Figure 2

(Color online) (a) Raw fluorescence data (dots) and fits [solid lines, see (b)]. (b) Fitted fluorescence curves of gold on flat metal film (yellow line in lower left corner), on bare silicon dioxide substrate (black solid line) and on resonant and off-resonant samples (dashed and dotted lines). (c) Decay rate density distributions corresponding to fluorescence curves in (b).Reuse & Permissions

Figure 3

(Color online) Results of our theoretical BEM calculations for a particle with $50\mathrm{nm}$ diameter and $12\mathrm{nm}$ height. (a) Temporal fluorescence decay of molecule ensemble situated in a ring of $30\mathrm{nm}$ width around the gold nanoparticle, and for molecule transition frequencies of plasmon resonance ($610\mathrm{nm}$, solid line) and off-resonance ($590\mathrm{nm}$, dashed line). The dotted line shows the fluorescence of the same ensemble in absence of the nanoparticle. (b) Radiative decay rate as a function of particle-molecule distance in units of the free radiative decay rate ${\gamma }_0$. The dashed-dotted line reports the excitation enhancement[6] at the exciting wavelength of $375\mathrm{nm}$. (c) Triangulated surface of disk-shaped particle used in our calculations. Density plot of (d) real and (e) imaginary part of surface charge induced by dipole located at a distance of $5\mathrm{nm}$ away from the nanoparticle and with dipole orientated along $x$. (f) Same as (e) but for dipole orientation along $y$.Reuse & Permissions