Nonreciprocal ultrastrong magnon-photon coupling in the bandgap of photonic crystals

We observe a nonreciprocal ultrastrong magnon-photon coupling in the bandgap of photonic crystals by introducing a single crystal YIG cylinder into copper photonic crystals cavity as a point defect. The coupling strength reaches up to 1.18 GHz, which constitutes about 10.9% of the photon energy comp...

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Bibliographic Details
Published in:arXiv.org 2023-04
Main Authors: Zhang, Chi, Hao, Zhenhui, Shi, Yongzhang, Jiang, Changjun, Ong, C K, Chai, Guozhi
Format: Article
Language:English
Subjects:
Coupling
Crystal defects
Energy gap
Magnons
Photonic crystals
Photons
Point defects
Signal transmission
Single crystals
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Summary:We observe a nonreciprocal ultrastrong magnon-photon coupling in the bandgap of photonic crystals by introducing a single crystal YIG cylinder into copper photonic crystals cavity as a point defect. The coupling strength reaches up to 1.18 GHz, which constitutes about 10.9% of the photon energy compared to the photon frequency around 10.8 GHz. It is fascinating that the coupling achieves unidirectional signal transmission in the whole bandgap. This study demonstrates the possibility of controlling nonreciprocal magnon-photon coupling by manipulating the structure of photonic crystals, providing new methods to investigate the influence of magnetic point defects on microwave signal transmission.
ISSN:2331-8422