研究目的
Investigating the coupling between optical whispering gallery modes and magnon modes localized at a vortex in a magnetic microdisk, and the tunability of this coupling by an externally applied magnetic field.
研究成果
The study demonstrates the potential of cavity optomagnonics with magnetic textures for quantum information processing platforms at the nanoscale. The optomagnonic coupling in a microdisk with a magnetic vortex shows a rich spatial structure and tunability by an external magnetic field, with predicted cooperativities significantly improved over the current state of the art. The results pave the way for optomagnonics with magnetic textures, including optically induced nonlinear vortex dynamics and exotic quantum states.
研究不足
The study focuses on theoretical and numerical simulations, with experimental validation not yet conducted. The practical realization of the proposed systems and the achievement of predicted cooperativities require further engineering and optimization.
1：Experimental Design and Method Selection:
The study combines analytical methods with micromagnetic and finite-element simulations to derive the spatial dependence and the strength of the optomagnonic coupling. Two qualitatively different regimes are studied: a very thin micromagnetic disk embedded in an optical cavity, and a thicker microdisk that also serves as the optical cavity.
2：Sample Selection and Data Sources:
The samples considered are YIG (yttrium iron garnet) disks at the microscale, with the presence of magnetic vortices demonstrated experimentally.
3：List of Experimental Equipment and Materials:
The study uses MuMax3 for micromagnetic simulations and finite-element simulations for the optical whispering gallery modes.
4：Experimental Procedures and Operational Workflow:
The coupling between optical whispering gallery modes and magnon modes localized at the vortex is studied by integrating over the whole volume, with the integration volume bounded by the magnon mode volume.
5：Data Analysis Methods:
The optomagnonic coupling is evaluated using the local optomagnonic coupling formula, and the results are compared with analytical approximate results for validation.
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