Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics II

Q 31.18: Poster

Dienstag, 24. März 2015, 17:00–19:00, C/Foyer

Dyadic Green Function of Spatially Dispersive Bodies: Towards Quantum Optics at Nanometre Separation — •Robin Schmidt and Stefan Scheel — Institut für Physik, Universität Rostock, Universitätsplatz 3, 18055 Rostock, Germany

With the advances in modern nanophotonics and nanooptics, ever smaller metallic and dielectric structures become feasible. The strongly confined evanescent fields are associated with enormous field enhancements, thus creating a platform for single-excitation quantum optics at nanometre separation. Quantum effects such as decay rates and dispersion forces depend on the local density of states (LDOS). Recently, the LDOS has been measured on nanoscales with high accuracy [1]. Both the LDOS and the Casimir forces can mathematically be described in terms of dyadic Green functions, which primarily depend on the geometrical settings and dielectric properties of media under consideration. At small separation nonlocal effects have to be taken into account, as the electromagnetic stress and energy density formally diverge at the surface [2].
Here we present the LDOS in the vicinity of a spatially dispersive dielectric sphere. The results have been obtained by making use of the Huygens principle and the extinction theorem. This approach does not require additional boundary conditions.
References:

[1] A. W. Schell, P. Engel, J.F.M. Werra, C. Wolff, K. Busch, and O.Benson, Nano Lett., 14 (5), 2623, (2014)

[2] S.A.R. Horsley and T.G. Philbin, New J. Phys. 16, 013030, (2014)