Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 26: Plasmonics and nanooptics II
O 26.2: Vortrag
Dienstag, 27. März 2012, 10:45–11:00, MA 005
Polarizing Beam Splitter - A new approach based on transformation optics — •Jonathan Mueller1 and Martin Wegener1,2 — 1Institut für Angewandte Physik and DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany — 2Institut für Nanotechnologie, Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany
Standard optical elements (e.g. lenses, prisms) are mostly designed of piecewise homogeneous and isotropic dielectrics. However, in theory one has far more possibilities to influence electromagnetic waves, namely all the components of the permittivity and permeability tensors. In the past few years, on the one hand, new microfabrication methods allowed for new freedom in controlling the optical parameters using so called artificial metamaterials. On the other hand, the theory of transformation optics has given a somewhat intuitive approach for the design of such structures. In our work, we focus on purely dielectric structures in a non-resonant and therefore non-lossy regime.
A polarizing beam splitter is chosen as the object of study since the use of transformation optics in this case provides some features that may be of interest for applications. Namely, the deviation angle does not vary as a function of tilts or shifts of the structure with respect to the incoming beam. Finite element simulations of a full metamaterial structure have been carried out and a practical method for the fabrication of the device using direct laser writing is proposed.