We have considered several limiting cases to validate the present quantum model. In particular, we confirmed that the Hamiltonian and Lindbladian contributions parameterized as described yield absorption spectra in agreement with those obtained from rigorous electrodynamics simulations. Further, we have confirmed that the RET efficiency as a function of donor-acceptor separation simulated by our method exhibits the expected 1/r 6 dependence (see Figures and in the SI). We also perform FDTD calculations of the electric field at the surface of an acceptor nanoparticle at various separations from a donor HNP as a classical electrodynamics analog of the RET phenomenon we are studying. We find that the magnitude of the induced electric field on the acceptor as a function of separation can be reasonably approximated by a 1/r 6 function, which suggests a strong dipolar contribution to the near-field interactions. Deviations from perfect 1/r 6 behavior could result from higherorder multipolar contributions to the nearfields of the metal nanoparticles, and also from the evanescent fields from the dielectric scattering resonances (see Figure )