Tunable Rotation-Associated Slow-to-Fast Light Conversion via Optomagnonic Coupling

TL;DR

This paper introduces a tunable optomagnonic system integrating photons, phonons, and magnons to achieve controllable slow-to-fast light conversion, overcoming the fixed-frequency limitations of traditional optomechanics.

Contribution

The work develops a theoretical model and demonstrates numerically that magnon degrees of freedom enable dynamic, multi-frequency light speed control in an integrated optomagnonic system.

Findings

Achieved bidirectional slow-to-fast and fast-to-slow light conversion.

Demonstrated control of light speed via cavity mode detuning.

Enabled dynamic switching between slow and fast light at multiple frequencies.

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 light speed conversion (slow-to-fast and fast-to-slow) via continuous control field frequency modulation to tune cavity mode detuning. 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 multi-frequency light speed control, with potential applications in all-optical networks and quantum communications.