Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 15: Quantum chaos I

DY 15.6: Vortrag

Mittwoch, 25. März 2009, 15:30–15:45, HÜL 386

Microwave experiments with dielectric circular billiards — •Stefan Bittner, Barbara Dietz, Maksim Miski-Oglu, Pedro Oria-Iriarte, Achim Richter, and Florian Schäfer — Institut für Kernphysik Darmstadt, Germany

Microlasers typically consist of a flat dielectric micro-cavity surrounded by media with smaller index of refraction. For the theoretical description of the three-dimensional electromagnetic fields of highly excited modes one usually uses a two-dimensional approximation based on the so-called effective index of refraction. The validity and precision of this approximation is tested experimentally with two flat circular microwave resonators of different height made of Teflon. The resonance frequencies as well as intensity distributions of several hundreds of TE- and TM-modes were measured, and the related quantum numbers were identified. These data are compared to computations based on the effective index of refraction approximation. Significant deviations between the measured and computed resonance frequencies as well as the resonance widths were found for both polarizations and especially in the long wavelength limit.