All simulations were carried out using the software COMSOL Multiphysics, which is a commercially available finite-element solver. The AuNR was modeled as a cylinder with a diameter of 10 nm and a length of 35 nm. To approximate the shapes visible in the TEM images, the ends of the cylinder were not taken as flat surfaces, but instead constructed as half spheres with a radius of 5 nm. The permittivity of gold was taken from the published paper (39). The refractive index of the surrounding medium (water) was 1.332. The intrinsic quantum yields (ATTO 550, q0 = 0.8; ATTO 647 N, q0 = 0.65) and the intrinsic emission spectra of the two fluorophores were taken as specified by the supplier (www.atto-tec.com).

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