Frankfurt 2006 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 64: Photonische Kristalle V
Q 64.1: Vortrag
Donnerstag, 16. März 2006, 14:00–14:15, HI
3D photonic quasicrystals for near-infrared frequencies — •A. Ledermann1, M. Wegener1, L. Cademartiri2, G. A. Ozin2, D. Wiersma3, and G. von Freymann4 — 1Institut für Angewandte Physik, Universität Karlsruhe (TH), 76128 Karlsruhe — 2Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada — 3European Laboratory for Nonlinear Spectroscopy and INFM-Matis, 1.50019-Sesto Fiorentino, Firenze, Italy — 4Institut für Nanotechnologie, Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft, 76021 Karlsruhe
Photonic quasicrystals (PhQCs) are deterministically generated structures without translational symmetry. As intermediate organization state between random materials and photonic crystals (PhCs) PhQCs are expected to provide yet richer physics than "normal" PhCs. Furthermore, PhQCs are expected to open complete band-gaps for lower index contrasts than expected for conventional PhCs. Besides these properties, which can be probed in microwave model experiments [1], even in perfect PhQCs a mixture of diffusive and ballistic transport channels as well as localized modes are expected. For corresponding experiments with pulsed laser sources, optical properties should lay in the near-infrared. Here we present for the first time PhQCs fabricated via direct laser writing [2] in photoresist. These structures are characterized by optical diffraction measurements. Comparison of these data with theory reveals the ten-fold symmetry expected for three-dimensional icosahedral PhQCs.
[1] W. Man et al., Nature 436, 993 (2005)
[2] M. Deubel et al., Nature Mater. 3, 444 (2004)