Decay dynamics in the coupled-dipole model

Abstract

Cooperative scattering in cold atoms has gained renewed interest, in particular in the context of single-photon superradiance, with the recent experimental observation of super-and subradiance in dilute atomic clouds. Numerical simulations to support experimental signatures of cooperative scattering are often limited by the number of dipoles which can be treated, well below the number of atoms in the experiments. In this paper, we provide systematic numerical studies aimed at matching the regime of dilute atomic clouds. We use a scalar coupled-dipole model in the low excitation limit and an exclusion volume to avoid density-related effects. Scaling laws for super-and subradiance are obtained and the limits of numerical studies are pointed out. We also illustrate the cooperative nature of light scattering by considering an incident laser field, where half of the beam has a $\pi$ phase shift. The enhanced subradiance obtained under such condition provides an additional signature of the role of coherence in the detected signal.

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• Subradiance and superradiance-to-subradiance transition in dilute atomic clouds
• Coherent light propagation through cold atomic clouds beyond the independent scattering approximation
• Van der Waals dephasing for Dicke subradiance in cold atomic clouds
• Subradiance in dilute atomic ensembles: Role of pairs and multiple scattering
• Localization versus subradiance in three-dimensional scattering of light
• Collective emission of photons from dense, dipole-dipole interacting atomic ensembles
• Photon-mediated dipole-dipole interactions as a resource for quantum science and technology in cold atoms
• Super- and subradiance in dilute disordered cold atomic samples: observations and interpretations
• Transport of light through a dense ensemble of cold atoms in a static electric field
• Cooperative atomic emission from a line of atoms interacting with a resonant plane surface
• Nanosecond-timescale development of Faraday rotation in an ultracold gas
• Condensation of vanishing photon emission rates in random atomic clouds