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Q: Quantenoptik und Photonik

Q 47: Photonik in komplexen & periodischen Strukturen

Q 47.2: Vortrag

Dienstag, 8. März 2005, 14:15–14:30, HU 2014a

Local fields in a soft matter bubble — •Carsten Henkel — Potsdam University, Germany

Light emission of atoms, molecules, and other light emitters embedded in dielectrics raises a fundamental question in macroscopic Maxwell theory: the relation between the field at the site of the emitter ("local field") and the macroscopic field that is recovered at large (superatomic) distances. Different models using spherical cavities have been used and lead to so-called local field corrections that have been argued to apply to interstitial and substitutional emitters, respectively [1]. We show that the local field problem is actually ill-defined in the following sense: once the surrounding medium is allowed to have a continuously varying dielectric constant ε(r), the local field correction depends on the function ε(r). The "empty-cavity" model is recovered for a step-wise variation. We compare to microscopic local-field theories [2] and discuss implications for impurities embedded in Bose-Einstein condensates.

[1] F. J. P. Schuurmans, P. de Vries, and A. Lagendijk, Phys. Lett. A 264 (2000) 472.

[2] M. E. Crenshaw and C. M. Bowden, Phys. Rev. Lett. 85 (2000) 1851.