Experimental generation of circulating cavity magnon polaritons
Jeremy Bourhill, Weichao Yu, Vincent Vlaminck, Gerrit E. W. Bauer,, Giueseppe Ruoso, Vincent Castel
TL;DR
This paper reports the experimental creation of chiral, unidirectional cavity magnon polaritons in a torus-shaped microwave cavity, demonstrating non-reciprocal microwave scattering and mode polarization control.
Contribution
It introduces a novel experimental setup for generating circularly polarized, unidirectional cavity magnon polaritons with broken mode degeneracy.
Findings
Demonstrated chiral cavity magnon polaritons in a torus-shaped cavity
Observed non-reciprocal microwave scattering behavior
Revealed mode polarization control at specific positions
Abstract
We experimentally realize circularly polarised unidirectional cavity magnon polaritons in a torus-shaped microwave cavity loaded by a small magnetic sphere. At special positions the clockwise and counterclockwise modes are circularly polarized, such that only one of them couples to the magnet, which breaks the mode degeneracy. We reveal the chiral nature of the spectral energy and angular momentum flow by observing and modelling non-reciprocities of the microwave scattering matrix.
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Taxonomy
TopicsMechanical and Optical Resonators · Metamaterials and Metasurfaces Applications · Strong Light-Matter Interactions