Title: Dipole-dipole interacting two-level emitters in a moderately intense laser field

Abstract: We investigate the resonance fluorescence features of a small ensemble of closely packed and moderately laser pumped two-level emitters at resonance. The mean distance between any two-level radiators is smaller than the corresponding emission wavelength, such that the dipole-dipole interactions are not negligible. We have found that under the secular approximation, the collective resonance fluorescence spectrum consists of 2N+1 spectral lines, where N is the number of emitters from the sample. The 2N lateral spectral-bands, symmetrically located around the generalized Rabi frequency with respect to the central line at the laser frequency, are distinguishable if the dipole-dipole coupling strength is larger than the collective spontaneous decay rate. This way, one can extract the radiators number within the ensemble via measuring of the spontaneously scattered collective resonance fluorescence spectrum. Contrary, if the dipole-dipole coupling is of the order of or smaller than the cooperative spontaneous decay rate, but still non-negligible, the spectrum turns into a Mollow-like fluorescence spectrum, where the two lateral spectral lines broadens, proportional to the dipole-dipole coupling strength, respectively.