Figure 2.

Numerical calculations of photophysical modifications in the vicinity of a single gold nanorod with a size of 63 nm × 25 nm. (a) PCR_max modifications normalized to that of a free space emitter PCR_max⁰, calculated with orientation-averaged radiative and total decay rate modifications as a function of fluorophore position. Fluorophores are assumed to be single-wavelength dipole emitters with a quantum yield of unity at 664 nm (resonant with the particle plasmon). (b) PCR_max modification normalized by the value of a free space fluorophore PCR_max. λ_exc = 637 nm and λ_em = 664 nm indicate the excitation and emission wavelengths. The SPR wavelength of the particles was tuned by changing their length while keeping their diameter at 25 nm. (c) I_sat modification normalized by the saturation intensity of a free space fluorophore I_sat⁰. For wavelength-dependent calculations, the dipole emitter is placed at 4 nm from the tip, and the results are orientation averaged.