We provide a comprehensive analytical description of the effective coupling associated with an antiresonance within a hybrid system comprised of a quasi-closed photonic cavity and a ferrimagnetic material. Whilst so-called level attraction between a resonant system inside an open cavity is well understood, the physical underpinnings of this phenomena within quasi-closed cavities have remained elusive. Leveraging the input-output theory, we successfully differentiate between the repulsive and attractive aspects of this coupling. Our proposed model demonstrates that by understanding the phase-jump at the resonances and the studied antiresonance, we can predict the nature of the effective coupling of the antiresonance for a given position of the ferrimagnet in the cavity.
@article{arxiv.2402.06258,
title = {Level attraction in a quasi-closed cavity},
author = {Guillaume Bourcin and Alan Gardin and Jeremy Bourhill and Vincent Vlaminck and Vincent Castel},
journal= {arXiv preprint arXiv:2402.06258},
year = {2024}
}