Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 53: Photonic crystals
HL 53.1: Vortrag
Mittwoch, 18. März 2015, 15:00–15:15, EW 015
Transport in three-dimensional aperiodic structures: Experiments and calculations — •Michael Renner1 und Georg von Freymann1,2 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern — 2Fraunhofer-Institute for Physical Measurement Techniques (IPM), Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern, Germany
To explore the mechanism of light transport in three-dimensional aperiodic structures we perform finite-difference time-domain (FDTD) simulations closely resembling our experimental geometry [1]. By incoherently adding individual mode profiles after excitation with Cassegrain-type point spread functions and taking into account the given collection optics we are able to reproduce experimental results obtained by an focal plane array (FPA) connected to a Fourier transform infrared spectrometer (FTIR). We confirm the experimentally observed sub-diffusive transport behavior in direct laser written polymer samples with different aperiodic spatial correlations. Structures based on the Rudin-Shapiro sequence show the strongest mode localization, in good agreement with the experiment. Comparisons with two-dimensional representations reveal less pronounced localization highlighting the importance of the aperiodic structuring in three dimensions.
[1] Renner, M. & von Freymann, G. Transverse Mode Localization in Three-Dimensional Deterministic Aperiodic Structures. Adv. Opt. Mater. 2, 226-230 (2014).