Berlin 2015 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 58: Poster - Fluids

DY 58.7: Poster

Donnerstag, 19. März 2015, 16:00–18:00, Poster A

Photonic Bands of Colloidal Quasicrystals — •Ricardo Atahualpa Solorzano Kraemer and Michael Schmiedeberg — Institut für Theoretische Physik II - Soft Matter, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany

Quasicrystals are structures with long-range positional order but no translational symmetry. These structures lie between periodic and disordered structures but still show sharp diffraction patterns that confirm the long-range order. They possess several interesting properties that differ from those of periodic crystals or glasses. This may lead to an important role for new photonic applications.

Determining photonic bands of quasiperiodic systems represents a challenge. In this work we study the paths of photons in quasiperiodic Lorentz gas models in order to calculate the photonic bands. The models can be extended to achieve more realistic results. For example, in order to consider the effects of refraction, we employ Fresnel's equations. In order to include diffraction, we use Mie scattering. We calculate the band structures for three different geometries: periodic square lattices, the quasiperiodic Penrose tilling, as well as for a quasicrystal with 8-fold rotational symmetry.