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DS: Dünne Schichten
DS 6: Anwendung dünner Schichten
DS 6.5: Vortrag
Freitag, 4. März 2005, 15:30–15:45, TU HS110
Polarization splitting based on planar photonic crystals — •Veronika Rinnerbauer1,2, Johann Schermer2, and Kurt Hingerl1 — 1Christian Doppler Labor für oberflächenoptische Methoden, Institut für Halbleiter und Festkörperphysik, Univ. Linz, Altenbergerstr. 69, A-4040 Linz, Austria — 2Photeon Technologies, Kirchstr. 35, A-6900 Bregenz, Austria
Planar polarization splitting devices based on photonic crystal slabs have been developed, their main advantages being the planar design and their possible integration into PLCs.
Due to their inherent polarization sensitivity, photonic crystals offer convenient solutions on a length scale of several tens of micrometers in silicon-based or other high index material systems. In a 2D photonic crystal slab, the presence of a horizontal symmetry plane allows us to decompose the guided modes into TE-like and TM-like polarization states, which are even and odd with respect to reflections through this plane. In this contribution, we will show three different principles that exploit the polarization dependency of these guided modes.
The first principle is based on reflection and transmission at a photonic crystal interface. The second one uses a defect waveguide for one polarization, and free propagation through the photonic crystal for the other polarization. In the third principle, defect waveguides with polarization-dependent guided modes are used for both polarizations.
Results from numerical simulations will be presented, which show that polarization splitting is possible with high efficiency in photonic crystal slabs.