Tunable rotation-associated slow-to-fast light conversion via optomagnonic coupling
Phys. Rev. A 113, 053514 – Published 12 May, 2026
DOI: https://doi.org/10.1103/nsv9-177g
Abstract
Cavity optomechanics has enabled slow-to-fast light conversion, but traditional optomechanic systems suffer from limited tunability due to fixed mechanical frequencies. To address this constraint, we introduce a magnon degree of freedom into an optomechanical system, constructing a system that integrates photons, phonons, and magnons. We establish the theoretical model of the optomagnonic-Laguerre-Gaussian rotational system and present numerical simulations of Fano resonances and group delay. By manipulating the magnon degree of freedom, we not only achieve slow-to-fast light conversion associated with magnons but also successfully realize such conversion effects associated with mechanical rotation—this achievement effectively overcomes the inherent tunability limitations of pure optomechanical systems and expands the frequency coverage of light conversion effects. Notably, we numerically demonstrate bidirectional tunable conversion between slow and fast light (including both slow-to-fast and fast-to-slow regimes) by continuously modulating the control field frequency to adjust the detuning between the control field and the cavity mode. Additionally, our results show that adjusting optomagnonic parameters enables dynamic switching between slow light and fast light at multiple frequencies. This work provides a flexible platform for multifrequency group velocity control, with potential applications in all-optical networks and quantum communications.
