Lamb shift multipolar analysis

Emmanuel Lassalle (1) , Alexis Devilez (2, 1) , Nicolas Bonod (1) , Thomas Durt (1) , Brian Stout (1)

1 CLARTE - CLARTE
2 LP2N - Laboratoire Photonique, Numérique et Nanosciences

It is now well established that radiative decay of quantum emitters can be strongly modified by their environment. In this paper we present an exact — within the weak-coupling approximation — multipole expression to compute the Lamb (frequency) shift induced by an arbitrary set of resonant scatterers on a nearby quantum emitter, using multi-scattering theory. We also adopt a Quasi-Normal Mode description to account for the line shape of the Lamb shift spectrum in the near-field of a plasmonic nanosphere. It is then shown that the Lamb shift resonance can be blue-shifted as the size of the nanoparticle increases, suggesting that nanoparticles may be used to tune this resonant interaction. Finally, a realistic calculation of the Lamb shift is made for a dimer configuration.

Domaines: Sciences de l'ingénieur [physics]

Emmanuel Lassalle, Alexis Devilez, Nicolas Bonod, Thomas Durt, Brian Stout. Lamb shift multipolar analysis. Journal of the Optical Society of America B, 2017, 34 (7), ⟨10.1364/JOSAB.34.001348⟩. ⟨hal-01571592⟩