Berlin 2005 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 36: Single molecules II

CPP 36.5: Vortrag

Mittwoch, 9. März 2005, 12:15–12:30, TU C243

Local field corrections for molecules in nanocavities — •Carsten Henkel — Universität Potsdam, Germany

Atoms, molecules, and other light emitters embedded in dielectrics are strongly coupled to their immediate environment. For a homogeneous, dense dielectric, the Lorenz-Lorentz or Clausius-Mossotti relation provides a link between the microscopic properties of its constituent molecules and its macroscopic properties (dielectric constant). We review recent results on these so-called “local field corrections” that differ for interstitial and substitutional emitters, respectively [1]. Our approach is motivated by experiments with emitters embedded in sub-wavelength sized particles [2]. For soft matter dielectrics, where the surrounding medium is allowed to have a continuously varying dielectric constant ε(r), we show that the local field problem is actually ill-defined: the correction depends on the way the function ε(r) approaches the homogeneous background. The “empty-cavity” model is recovered for a step-wise variation. We 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] A. Beveratos et al., Phys. Rev. A 64 (2001) 061802(R); H. Schniepp and V. Sandoghdar, Phys. Rev. Lett. 89 (2002) 257403; S. F. Wuister, C. de Mello Donegá, and Andries Meijerink, J. Chem. Phys. 121 (2004) 4310; L. Rogobete and C. Henkel, Phys. Rev. A (2004, in press).