Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 86: Photonic crystals and cavities

HL 86.1: Vortrag

Donnerstag, 3. April 2014, 09:30–09:45, POT 051

Transverse Mode Localization in Three-Dimensional Deterministic Aperiodic Structures — •Michael Renner1 and Georg von Freymann1,21Department 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

We study the propagation of light in three-dimensional deterministic aperiodic structures fabricated by Dip-in direct-laser-writing. This fabrication technique enables us to investigate previously inaccessible thick polymer structures containing more than 100 elements of the underlying aperiodic sequence along the vertical direction. We employ one general construction scheme derived from the square Fibonacci tiling to obtain structures of different lattice spectral types, namely pure-point (Fibonacci sequence), singular-continuous (Thue-Morse) and absolute-continuous (Rudin-Shapiro). Characteristic reflectance spectra confirm the presence of the desired spatial correlations in the fabricated samples. By measuring the effective width of an incoherent beam traversing structures of different heights we deduce sub-diffusive behavior for all sequences in the near-infrared spectral range. The slowest broadening is observed for Rudin-Shapiro structures for which we find exponentially decaying lateral mode profiles indicating the existence of localized states.

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