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Q: Quantenoptik und Photonik

Q 36: Poster Quanteneffekte

Q 36.12: Poster

Thursday, March 25, 2004, 14:00–16:00, Schellingstr. 3

Microresonators in tapered fibers — •Florian Warken, Yann Louyer, Dieter Meschede, and Arno Rauschenbeutel — Institut für Angewandte Physik, Wegelerstr. 8, 53115 Bonn

We aim to realize high Q microresonators in structured tapered optical fibers. The resonators have a highly prolate shape. They sustain whispering gallery modes which exhibit, in contrast to the equatorial modes commonly used in silica microsphere resonators, two spatially well separated caustics with a resonantly enhanced field strength. Different modes can be selectively excited by coupling light in and out of the resonator at the respective caustic. This will be accomplished by means of auxiliary tapered optical fiber couplers. Moreover, the free spectral range of our so-called “pendulum modes” is significantly smaller than for equatorial whispering gallery modes. Therefore, a tuning of the pendulum modes over one free spectral range can easily be achieved, e. g. by strain tuning. The advantageous mode geometry of the resonators, in combination with their tunability, opens 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 pendulum mode is conceivable.