中国物理B ›› 2023, Vol. 32 ›› Issue (10): 107601-107601.doi: 10.1088/1674-1056/acf039

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Eigenstates and temporal dynamics in cavity optomagnonics

Yun-Jing Ding(丁云静)1 and Yang Xiao(肖杨)2,†   

  1. 1 School of Physics, Nanjing University, Nanjing 210093, China;
    2 Department of Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • 收稿日期:2023-03-25 修回日期:2023-07-10 接受日期:2023-08-15 出版日期:2023-09-21 发布日期:2023-09-27
  • 通讯作者: Yang Xiao E-mail:fryxiao@nuaa.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. NSFC61974067 and 62374087). We thank Prof. Ke Xia and Prof. C. M. Hu for their helpful comments in doing this work.

Eigenstates and temporal dynamics in cavity optomagnonics

Yun-Jing Ding(丁云静)1 and Yang Xiao(肖杨)2,†   

  1. 1 School of Physics, Nanjing University, Nanjing 210093, China;
    2 Department of Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2023-03-25 Revised:2023-07-10 Accepted:2023-08-15 Online:2023-09-21 Published:2023-09-27
  • Contact: Yang Xiao E-mail:fryxiao@nuaa.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. NSFC61974067 and 62374087). We thank Prof. Ke Xia and Prof. C. M. Hu for their helpful comments in doing this work.

摘要: Many studies of magnon-photon coupling are performed in the frequency domain for microwave photons. In this work, we present analytical results of eigenfrequency, eigenstates, and temporal dynamics for the coupling between ferromagnetic magnon and visible photon. In contrast to microwave photons, optical photons can be coupled with magnon in a dispersive interaction which produces both level repulsion and attraction by varying the magnon-photon frequency detuning. At resonance, the hybridized states are of linear polarization and circular polarization for level repulsion and level attraction respectively. As the detuning increases, the polarizations of level repulsion remain linear but those of level attraction vary from elliptical to linear polarizations. The temporal dynamics of level repulsion presents the beat-like behavior. The level attraction presents monotonous decay in the weak coupling regime but gives rise to instability in the strong coupling regime due to the magnon amplification. As the detuning is large, both magnon and photon amplitudes present a synchronizing oscillation. Our results are important for exploring the temporal evolution of magnon-photon coupling in the range of optical frequency and designing magnon-based timing devices.

关键词: magnon, spin wave, cavity

Abstract: Many studies of magnon-photon coupling are performed in the frequency domain for microwave photons. In this work, we present analytical results of eigenfrequency, eigenstates, and temporal dynamics for the coupling between ferromagnetic magnon and visible photon. In contrast to microwave photons, optical photons can be coupled with magnon in a dispersive interaction which produces both level repulsion and attraction by varying the magnon-photon frequency detuning. At resonance, the hybridized states are of linear polarization and circular polarization for level repulsion and level attraction respectively. As the detuning increases, the polarizations of level repulsion remain linear but those of level attraction vary from elliptical to linear polarizations. The temporal dynamics of level repulsion presents the beat-like behavior. The level attraction presents monotonous decay in the weak coupling regime but gives rise to instability in the strong coupling regime due to the magnon amplification. As the detuning is large, both magnon and photon amplitudes present a synchronizing oscillation. Our results are important for exploring the temporal evolution of magnon-photon coupling in the range of optical frequency and designing magnon-based timing devices.

Key words: magnon, spin wave, cavity

中图分类号:  (Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance)

  • 76.50.+g
85.70.Ge (Ferrite and garnet devices)