Regensburg 2002 – wissenschaftliches Programm

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DF: Dielektrische Festkörper

DF 6: Poster

DF 6.12: Poster

Mittwoch, 13. März 2002, 14:30–18:00, Poster Chemie C

High-Q microwave resonators with photonic crystals — •Michael Schuster, Daniel Parkot, and Norbert Klein — Forschungszentrum Jülich, Institut für Schichten und Grenzflächen

We have investigated localised resonant modes of extended defects in 2 dimensional hexagonal photonic crystals.

Quasi-3d field simulations have been performed for a photonic crystal made of dielectric (Al₂O₃) rods with band gaps between 10 and 30 GHz and for a structure of air holes in dielectric (Al₂O₃) with a band gap around 30 GHz. We have investigated field distribution, dielectric filling factor and wall losses of photonic crystal defect modes in a metal resonator cavity. We found that the dielectric filling factor of the modes κ_diel could be brought down to 0.3, thus decreasing dielectric losses in the resonator while retaining low metal losses with Q factors in the order of 60000-100000 for the resonator walls. We found that the field distribution of the localised modes was very similar to well known metal cavity modes, and that the dielectric filling factor was dependent on the distance between mode frequency and band gap.

We have employed a microwave cavity resonator for the measurement of high-Q resonances with a TE-mode-like field distribution in the structure of dielectric holes, and found localised modes with Q factors up to 4000, mainly determined by dielectric losses and lacking mode confinement along the resonator axis.

Furthermore, we have started field simulations for defects in 3d photonic crystal structures to further improve field confinement in all directions and increase resonator Q factors.