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The modified radiative and non-radiative states due to the weak coupling ofan emitter with other resonant objects (Purcell effect), can be recast as aquantum interference of the paths of the photon that define the classicalscattering and absorption by the object. When the coupling is stronger,additional paths representing the (Rabi oscillations or) possible re-absorptionof the photon from the excited object, by the emitter at ground-state, have tobe included in the quantum interference. The effect of these additional Rabipaths of the photon on the radiative states and the efficiency of spontaneousemission, can be approximated using a simple one-loop correction to theweak-coupling approximation. This effect is especially evident in the anomalousenhancements of emission due to extremely small non-scattering (or fullyabsorbing) metal nanoparticles less than 10 nm in dimensions. Extending thesecorrections to a collective model of spontaneous emission that includesmultiple emitters and such very small metal nanoparticles coupled to eachother, the large contribution of Rabi paths to radiative decay in such bulkmaterials is elucidated.

Role of Rabi oscillations in radiative states due to the fully absorbing smaller plasmonic nanoparticles