Hannover 2003 – wissenschaftliches Programm
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Q: Quantenoptik
Q 53: Photonik in komplexen Strukturen
Q 53.2: Vortrag
Freitag, 28. März 2003, 14:15–14:30, F142
Photonic crystals in low index materials — •Rumen Iliew1, Markus Augustin2, Hans-Jörg Fuchs2, Christoph Etrich1, Ulf Peschel1, Stefan Nolte2, Ernst-Bernard Kley2, Andreas Tünnermann2, and Falk Lederer1 — 1Institut für Festkörpertheorie und Theoretische Optik, FSU Jena — 2Institut für Angewandte Physik, FSU Jena
Up to now research in 2D photonic crystal slabs has concentrated mainly on semiconductors with a high in-plane index contrast. In this presentation we will demonstrate the realization of 2D photonic crystals (PCs), PC waveguides and bends in glass-like oxides with a substantially lower refractive index of 2.16.
We will discuss the advantages and disadvantages of these components regarding propagation and coupling losses, relative size of the band gap, dimensions for single mode waveguidance and bend efficiencies.Due to the low index contrast a proper design of the inplane PC structure and of a proper slab thickness for single mode guidance is crucial for obtaining a band gap guided defect mode at the desired wavelength of 1.55 µm. The structures were designed by means of 3D band structure calculations and show a band gap for TE polarized light. Experimentally we observed an absolute transmission through the complete setup (including coupling losses) as high as 1% for a 60 degree PC double bend (∼ 50% per bend).
We will demonstrate good agreement between 3D finite-difference time-domain propagation calculations of PC waveguides and bends with the experimentally obtained results.