Theoretical study of light scattering and emission from dense ensembles of resonant dipoles

Nicolaas Jacobus Schilder 1
1 Laboratoire Charles Fabry / Naphel
LCF - Laboratoire Charles Fabry
Abstract : We present a theoretical study of the optical properties of a dense ensemble of resonant dipoles. We consider two particular cases: scattering of light by cold atomic clouds and electroluminescence by a thin film of colloidal quantum dots (cQDs) placed in the vicinity of a plasmonic metasurface. By numerically varying the atomic density, we have shown that light scattering by an atomic cloud gradually moves from a purely diffusive regime towards a partially diffractive and diffusive one. This property makes an atomic cloud an interesting system to study resonant light scattering. It has been found that light scattering is no longer due to single atom scattering but due to collective modes extended throughout the sample. These microscopic modes can be identified with the modes of Maxwell's equations for an object with the same shape and an effective refractive index. We have studied the onset of the homogenization regime, namely the suppression of diffuse light. Against all odds, an atomic cloud, with a refractive index at resonance that is comparable to that of a metal, never reaches the homogenization regime and thus continues to scatter light. Finally, we have also studied the electroluminescence of a dense film of cQDs. We propose a model for electroluminescence from cQDs located close to a plasmonic metasurface.
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Nicolaas Jacobus Schilder. Theoretical study of light scattering and emission from dense ensembles of resonant dipoles. Optics [physics.optics]. Université Paris-Saclay, 2016. English. ⟨NNT : 2016SACLO019⟩. ⟨tel-01468678⟩

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