Regensburg 2007 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 22: Photonic crystals II
HL 22.1: Vortrag
Dienstag, 27. März 2007, 14:00–14:15, H13
Three-dimensional polymer and silicon inverse photonic quasicrystals for infrared frequencies — •Alexandra Ledermann1, Ludovico Cademartiri2, Martin Hermatschweiler1, Costanza Toninelli3, Geoffrey Ozin2, Diederik Wiersma3, Martin Wegener1, and Georg von Freymann1 — 1Institut für Nanotechnologie, Forschunszentrum Karlsruhe, DFG-Center for Functional Nanostructures (CFN) and Institut für Angewandte Physik, Universität Karlsruhe (TH) — 2Department of Chemistry, University of Toronto — 3European Laboratory for Nonlinear Spectroscopy (LENS) and INFM, Firence
Quasicrystals (QC) represent a class of solids which lack translational symmetry, but exhibit perfect long-range order and reveal well-defined rotational symmetries, not necessarily consistent with periodicity. Using direct laser writing [1] we fabricate three-dimensional icosahedral SU-8 photonic QC of high quality, characterized by electron microscope images and visible-light Laue diffraction experiments [2]. Reflectance measurements indicate a stop band in the infrared. These SU-8 structures serve as templates for a subsequent novel silicon inversion procedure [3]. Electron microscope images and Laue diffraction patterns prove the successful fabrication of the silicon inverse photonic QC. This work paves the road for future work on low- or high-index contrast photonic QC.
[1] M. Deubel et al., Nature Materials, 3, 444 (2004).
[2] A. Ledermann et al., Nature Materials, 5, 942 (2006).
[3] M. Hermatschweiler et al., submitted (2006).