Regensburg 2004 – scientific programme
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HL: Halbleiterphysik
HL 15: Photonische Kristalle III
HL 15.11: Talk
Tuesday, March 9, 2004, 12:45–13:00, H17
Waveguides and Bends in a Photonic Crystal with a low in-plane index — •Markus Augustin1, Rumen Iliew2, Hans-Jörg Fuchs1, Fabian Röser1, Christoph Etrich2, Detlef Schelle1, Ulf Peschel2, Stefan Nolte1, Ernst-Bernard Kley1, Falk Lederer2, and Andreas Tünnermann1 — 1Institut für Angewandte Physik, FSU Jena — 2Institut für Festkörpertheorie und Theoretische Optik, FSU Jena
During the past several years photonic crystals (PCs) have attracted much interest as miniaturized devices, where the flow of photons can be controlled. Some emphasis was on the optimization of sharp waveguide bends, which are required for a future all-optical integration. Here we will demonstrate the realization of 2D PC bends in glass-like oxides with a low refractive index of 2.1 compared to the more established semiconductor PCs. We will discuss the design, fabrication and experimental results of PC waveguides (PCWGs) and bends. In a slab system with a low in-plane index contrast effectively single mode W3-PCWG (three rows of holes omitted) with low losses (8.5 dB/mm) and highly efficient PCWG-bends (75 %transmission/bend) have been realized. This high efficiency has been obtained by optimizing the bend geometry by means of 3D finite-difference time-domain (FDTD) calculations. Both values for the W3-PCWG, waveguide losses and bend efficiency, are comparable to the best values reported so far for semiconductor heterostructure PCs. By investigating the near field of the W3-PCWGs it could be shown that after a certain length (<0.8mm) the W3 is effectively single mode. Hence, low index amorphous materials can perform as well as semiconductors.