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DY: Dynamik und Statistische Physik

DY 15: Quantum Chaos

DY 15.8: Vortrag

Montag, 27. März 2006, 16:45–17:00, SCH 251

Description of optical microresonators: When rays suffice — •Martina Hentschel — Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg — ATR Wave Engineering Laboratories, 2-2-2 Hikaridai, Kyoto 619-0228, Japan

Optical microresonators are interesting not only as model systems in the field of quantum chaos but also as components of future communication devices. This raises the question to what extent, based on the concept of ray-wave correspondence, the simple ray model can be deployed in application-oriented problems. It is well-known that for small size parameters (below approximately 500) semiclassical corrections, namely the Goos-Hänchen and Fresnel filtering effects, become important and potentially spoil ray model predictions. However, for large size parameters (above 1000, say) the ray model should suffice. The high capabililty of the ray model in this regime is confirmed and illustrated by various examples. We explain, for instance, a neat experiment in which a quadrupolar glass fiber showed a filter characteristics for specific setup geometries. Ray simulations reveal that this effect resulted from multiple beam interference that is possible in a limited parameter range around the conditions met in experiment.