Berlin 2012 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 29: Posters II
DY 29.2: Poster
Donnerstag, 29. März 2012, 17:00–19:00, Poster A
Periodically driven microwave systems - theory and experimental realization — •Stefan Gehler1, Ulrich Kuhl1,2, Hans-Jürgen Stöckmann1, and Timur Tudorovskiy3 — 1Fachbereich Physik, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany — 2LPMC, CNRS UMR 6622, Université de Nice Sophia-Antipolis, 06108 Nice, France — 3Radboud Universiteit, IMM, Heyendaalsweg 135, 6525AJ Nijmegen, Netherlands
A theoretical description and an experimental realization of a periodically perturbed (Floquet) microwave system will be presented. In previous works perturbations of cavities by stationary antennas had been theoretically studied [1] and experimentally verified [2].
This work has now been extended to antennas with a time dependent coupling between antenna and cavity. For an isolated single perturbed resonance the description showed up to be similar to the description of a resonant circuit with a time dependent capacitance. For the experimental realization we developed a resonator with a small inductivity and resistance. Using a varicap as a capacitor the resonance frequency can be changed periodically. A microwave field was driven with a frequency close to the resonator resonance frequency leading to complicated sideband structures. The different obtained sideband structures could be explained perfectly well by the present theory.
T. Tudorovskiy, R. Höhmann, U. Kuhl, and H.-J. Stöckmann, J. Phys. A 41, 275101, 2008.
T. Tudorovskiy, U. Kuhl, and H.-J. Stöckmann, J. Phys. A 44, 135101 (2011).