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Q: Quantenoptik und Photonik

Q 36: Quanteneffekte II

Q 36.7: Vortrag

Dienstag, 8. März 2005, 12:15–12:30, HU 1072

Whispering Gallery Mode Resonators in Microstructured Tapered Optical Fibers — •Louyer Yann, Warken Florian, Meschede Dieter, and Rauschenbeutel Arno — Institut für Angewandte Physik, Universität Bonn, Wegelerstr. 8, 53115 Bonn

We present a theoretical description of a novel type of whispering gallery mode (WGM) resonators, realized by microstructuring tapered optical fibers. The resonators have a highly prolate shape giving rise to WGMs for the radial component. Along the resonator axis, the light is trapped between two spatially well separated caustics with an enhanced field strength. By deriving the wave equation and by using the method of adiabatic invariants, we calculate the spatial mode structure and its spectral properties. We predict a mode volume competing with microsphere resonators. At the same time, the predicted free spectral range is much smaller than for microsphere WGMs, promising a more advantageous tunability. These properties open interesting perspectives for confining and controlling light. In particular, in the framework of cavity quantum electrodynamics, a deterministic coupling of laser-trapped atoms to the mode is conceivable.

Financial support by the DFG research unit 557 is gratefully acknowledged.