Dresden 2020 – scientific programme
The DPG Spring Meeting in Dresden had to be cancelled! Read more ...
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 43: Plasmonics and Nanooptics III: Periodic Structures and Theory
O 43.1: Talk
Tuesday, March 17, 2020, 10:30–10:45, WIL A317
Mie Theory in terms of Axion-Plasmonics — •Johannes Schultz1, Axel Lubk1,2, Flavio S. Nogueira3, and Bernd Büchner1,2 — 1IFF, IFW Dresden, Helmholtzstr. 20, 01069 Dresden — 2IFMP, TU Dresden, Haeckelstr. 3, 01069 Dresden — 3ITF, IFW Dresden, Helmholtzstr. 20, 01069 Dresden
Calculations of the scattering of electromagnetic (e.m.) waves is a usefull and important tool to investigate the dielectric response of nanoparticles (NPs) theoretically. Of particular interest are NPs with negativ dieletric function and low damping in a certain frequency regime at the same time. This leads to standing waves of oscillating electrons at the surface of the NP, so called localized surface plasmons. Solving the problem using Maxwells equations leads to determin the so called scattering coefficients from the boundary conditions at the interface. For arbitrary geometries it is hard to obtain the boundary conditions and consequently to get a complete analytic solution. However, exploiting the symmetry of spherical NPs we can determin a full analytic solution. This approach is known as Mie-Thoery and can be applied on many scattering problems including scattering at plasmonic NPs. In our study we generalized the common Mie-Theory to spheres consisting of Topological Insulators (TIs). The exceptional so called Axion-coupling of the e.m. fields in TIs leads to modified boundary conditions and resultant scattered fields. In summary we found uncommon magnetic field contributions for the scattering on TIs which vanish for trivial materials. This exceptional field contributions can maybe measured in the transmission electron microscope.