Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.34: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
Controlling the phase in coupled magnon-photonic circuits — •Christine Dörflinger1, Isabella Boventer1,2, Marco Pfirrmann1, Tomislav Piskor1, Alexey Ustinov1, Mathias Kläui2, and Martin Weides1,2 — 1Karlsruhe Institute of Technology, Physikalisches Institut, Karlsruhe, Germany — 2Johannes-Gutenberg University, Institute of Physics, Mainz, Germany
Polaritons are quasiparticles describing hybridized states resulting from light-matter interactions. They offer new perspectives for applications in information processing technology. In this work, we focus on magnon-photon-polaritons (MPPs) describing electromagnetic coupling between collective spin excitations of a magnetically ordered material and photons. Our interest is to study the MPP's anticrossing spectrum when such a system features a relative phase shift between a resonator mode and the uniform spin precession of the Kittel mode. Experimentally, we introduce an additional drive of adjustable phase compared to standard experiments. Therefore we utilize a sandwich design consisting of a lambda/2 microwave resonator, a YIG film and a microstrip line. Both the resonator and the middle segment of the microstrip line are aligned parallel to an external static magnetic field and are driven by the same source but variably shifted in phase. With this setup we aim to measure the phase dependency of the transmission and reflection spectra and discuss the influences on the MPP line shape. Tuning the anticrossing gap could offer new possibilities for applications such as amplifiers and interferometers.