Dissipative coupling in cavity magnonics
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Date
2023-11-14
Authors
Yang, Ying
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Abstract
This thesis delves into the intricacies of coupled cavity magnonic systems, aiming to construct higher orders of complexity with multiple components. It sheds light on the dissipative photon-magnon coupling by introducing dissipation and subsequently broadening the scope of the dissipatively coupled system across time and space. Initially, this thesis offers a comprehensive review of coherent coupling in closed systems, emphasizing the consideration of energy. Progressing further, the incorporation of dissipation in open systems is elucidated, laying out both the theoretical foundation and experimental validation for energy level attraction in dissipative coupling. The interplay with coherent coupling showcases the potential of nonreciprocity in applications like isolators and circulators. Two non-Hermitian singularities, namely exceptional points (EPs) and bound states in the continuum (BICs), are explored in dissipative coupling with anti-parity-time (PT ) symmetry, underscoring practical applications like eigenmodes control, sensors and slow light. Moreover, by incorporating time as a third layer of complexity, this thesis employs Floquet theory to an open dissipatively-coupled cavity magnonic system. This approach paves the way for controlling previously elusive hybrid systems, like the higher-order EP. Finally, spatial distance is integrated as a fourth component to complete our hierarchical structure, by achieving remarkable long-distance coupling exceeding 1 meter. Notably, BIC emerges in long-distance coherent coupling, facilitating high-efficiency, long-range BIC transfers between discrete systems, hinting at promising possibilities for future networks. In summary, this thesis broadens the understanding of cavity magnonics by venturing beyond energy to explore dissipation, time, and spatial distance as additional components. The insights gleaned from this exploration not only enrich the field of cavity magnonics with wide-ranging applications, but also lay a robust groundwork for further exploration in related fields.
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Keywords
Cavity Magonics, Dissipative Coupling, Singularities, Time Modulation, Long-distance Coupling