Hannover 2016 – scientific programme

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P: Fachverband Plasmaphysik

P 20: Poster Session- Low Temperature Plasmas

P 20.8: Poster

Wednesday, March 2, 2016, 16:30–19:00, Empore Lichthof

Light scattering by a stratified dielectric particle — •Elena Thiessen, Franz Xaver Bronold, and Holger Fehske — Institut für Physik, Universität Greifswald, 17489 Greifswald, Germany

We present an exact rewriting of the Mie coefficients describing the scattering of light by a stratified dielectric particle which enables their interpretation in terms of an hybridization of the surface modes arising at each interface. We thus obtain from the Mie theory analytically for an arbitrary number of shells and for all multipole orders and hence for arbitrarily sized particles the hybridization scenario, which so far has been employed primarily for small particles in the electrostatic approximation [1]. To illustrate the effect surface mode hybridization has on the topology of the inner and outer electromagnetic fields we analyze in detail the lowest order resonances of a dielectric core-shell particle. In accordance with the hybridization scenario they can be classified as bonding or anti-bonding. The former giving rise to in-phase and the latter to out-of-phase polarization-induced surface charges at the two interfaces of the particle. Outside the particle the Poynting field carries for both types of resonances the topology of anomalous light scattering. Inside the particle however it depends on the type of the resonance and hence reflects the core-shell structure of the particle. The same holds for the inner electric field which determines for instance the spatial variation of dissipation of energy inside the particle [2]. — Supported by the DFG through CRC/Transregio TRR24.

[1] E. Thiessen et al., arXiv:1507.08122

[2] E. Thiessen et al., Phys. Rev. A 91, 043837 (2015)